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1159 lines
34 KiB
C++
1159 lines
34 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public License
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* Version 1.0 (the "NPL"); you may not use this file except in
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* compliance with the NPL. You may obtain a copy of the NPL at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the NPL is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
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* for the specific language governing rights and limitations under the
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* NPL.
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*
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* The Initial Developer of this code under the NPL is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All Rights
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* Reserved.
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*/
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#include "nsSpaceManager.h"
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#include "nsPoint.h"
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#include "nsRect.h"
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#include "nsSize.h"
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#include <stdlib.h>
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#include "nsVoidArray.h"
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static NS_DEFINE_IID(kISpaceManagerIID, NS_ISPACEMANAGER_IID);
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PR_CALLBACK PLHashNumber
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NS_HashNumber(const void* key)
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{
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return (PLHashNumber)key;
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}
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PR_CALLBACK PRIntn
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NS_RemoveFrameInfoEntries(PLHashEntry* he, PRIntn i, void* arg)
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{
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nsSpaceManager::FrameInfo* frameInfo = (nsSpaceManager::FrameInfo*)he->value;
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NS_ASSERTION(nsnull != frameInfo, "null frameInfo");
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delete frameInfo;
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return HT_ENUMERATE_REMOVE;
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}
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/////////////////////////////////////////////////////////////////////////////
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// BandList
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nsSpaceManager::BandList::BandList()
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: BandRect(-1, -1, -1, -1, (nsIFrame*)nsnull)
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{
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PR_INIT_CLIST(this);
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numFrames = 0;
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}
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void
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nsSpaceManager::BandList::Clear()
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{
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if (!IsEmpty()) {
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BandRect* bandRect = Head();
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while (bandRect != this) {
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BandRect* next = bandRect->Next();
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delete bandRect;
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bandRect = next;
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}
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PR_INIT_CLIST(this);
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}
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}
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/////////////////////////////////////////////////////////////////////////////
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// nsSpaceManager
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nsSpaceManager::nsSpaceManager(nsIFrame* aFrame)
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: mFrame(aFrame)
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{
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NS_INIT_REFCNT();
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mX = mY = 0;
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mFrameInfoMap = nsnull;
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}
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void
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nsSpaceManager::ClearFrameInfo()
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{
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if (nsnull != mFrameInfoMap) {
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PL_HashTableEnumerateEntries(mFrameInfoMap, NS_RemoveFrameInfoEntries, 0);
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PL_HashTableDestroy(mFrameInfoMap);
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mFrameInfoMap = nsnull;
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}
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}
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nsSpaceManager::~nsSpaceManager()
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{
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mBandList.Clear();
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ClearFrameInfo();
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}
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NS_IMPL_ISUPPORTS(nsSpaceManager, kISpaceManagerIID);
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NS_IMETHODIMP
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nsSpaceManager::GetFrame(nsIFrame*& aFrame) const
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{
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aFrame = mFrame;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsSpaceManager::Translate(nscoord aDx, nscoord aDy)
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{
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mX += aDx;
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mY += aDy;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsSpaceManager::GetTranslation(nscoord& aX, nscoord& aY) const
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{
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aX = mX;
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aY = mY;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsSpaceManager::YMost(nscoord& aYMost) const
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{
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if (mBandList.IsEmpty()) {
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aYMost = 0;
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} else {
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BandRect* lastRect = mBandList.Tail();
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aYMost = lastRect->bottom;
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}
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return NS_OK;
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}
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/**
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* Internal function that returns the list of available and unavailable space
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* within the band
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*
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* @param aBand the first rect in the band
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* @param aY the y-offset in world coordinates
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* @param aMaxSize the size to use to constrain the band data
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* @param aAvailableBand
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*/
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nsresult
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nsSpaceManager::GetBandAvailableSpace(const BandRect* aBand,
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nscoord aY,
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const nsSize& aMaxSize,
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nsBandData& aBandData) const
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{
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nscoord topOfBand = aBand->top;
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nscoord localY = aY - mY;
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nscoord height = PR_MIN(aBand->bottom - aY, aMaxSize.height);
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nsBandTrapezoid* trapezoid = aBandData.trapezoids;
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nscoord rightEdge = mX + aMaxSize.width;
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// Initialize the band data
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aBandData.count = 0;
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// Skip any rectangles that are to the left of the local coordinate space
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while (aBand->top == topOfBand) {
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if (aBand->right > mX) {
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break;
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}
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// Get the next rect in the band
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aBand = aBand->Next();
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}
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// This is used to track the current x-location within the band. This is in
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// world coordinates
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nscoord left = mX;
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// Process the remaining rectangles that are within the clip width
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while ((aBand->top == topOfBand) && (aBand->left < rightEdge)) {
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// Compare the left edge of the occupied space with the current left
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// coordinate
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if (aBand->left > left) {
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// The rect is to the right of our current left coordinate, so we've
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// found some available space
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if (aBandData.count >= aBandData.size) {
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// Not enough space in the array of trapezoids
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aBandData.count += 2 * aBand->Length() + 2; // estimate the number needed
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return NS_ERROR_FAILURE;
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}
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trapezoid->state = nsBandTrapezoid::Available;
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trapezoid->frame = nsnull;
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// Assign the trapezoid a rectangular shape. The trapezoid must be in the
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// local coordinate space, so convert the current left coordinate
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*trapezoid = nsRect(left - mX, localY, aBand->left - left, height);
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// Move to the next output rect
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trapezoid++;
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aBandData.count++;
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}
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// The rect represents unavailable space, so add another trapezoid
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if (aBandData.count >= aBandData.size) {
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// Not enough space in the array of trapezoids
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aBandData.count += 2 * aBand->Length() + 1; // estimate the number needed
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return NS_ERROR_FAILURE;
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}
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if (1 == aBand->numFrames) {
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trapezoid->state = nsBandTrapezoid::Occupied;
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trapezoid->frame = aBand->frame;
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} else {
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NS_ASSERTION(aBand->numFrames > 1, "unexpected frame count");
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trapezoid->state = nsBandTrapezoid::OccupiedMultiple;
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trapezoid->frames = aBand->frames;
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}
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nscoord x = aBand->left;
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// The first band can straddle the clip rect
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if (x < mX) {
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// Clip the left edge
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x = mX;
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}
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// Assign the trapezoid a rectangular shape. The trapezoid must be in the
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// local coordinate space, so convert the rects's left coordinate
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*trapezoid = nsRect(x - mX, localY, aBand->right - x, height);
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// Move to the next output rect
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trapezoid++;
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aBandData.count++;
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// Adjust our current x-location within the band
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left = aBand->right;
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// Move to the next rect within the band
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aBand = aBand->Next();
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}
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// No more rects left in the band. If we haven't yet reached the right edge,
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// then all the remaining space is available
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if (left < rightEdge) {
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if (aBandData.count >= aBandData.size) {
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// Not enough space in the array of trapezoids
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aBandData.count++;
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return NS_ERROR_FAILURE;
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}
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trapezoid->state = nsBandTrapezoid::Available;
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trapezoid->frame = nsnull;
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// Assign the trapezoid a rectangular shape. The trapezoid must be in the
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// local coordinate space, so convert the current left coordinate
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*trapezoid = nsRect(left - mX, localY, rightEdge - left, height);
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aBandData.count++;
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}
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return NS_OK;
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}
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NS_IMETHODIMP
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nsSpaceManager::GetBandData(nscoord aYOffset,
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const nsSize& aMaxSize,
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nsBandData& aBandData) const
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{
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NS_PRECONDITION(aBandData.size >= 1, "bad band data");
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nsresult result = NS_OK;
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// Convert the y-offset to world coordinates
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nscoord y = mY + aYOffset;
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// If there are no unavailable rects or the offset is below the bottommost
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// band, then all the space is available
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nscoord yMost;
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YMost(yMost);
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if (y >= yMost) {
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// All the requested space is available
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aBandData.count = 1;
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aBandData.trapezoids[0] = nsRect(0, aYOffset, aMaxSize.width, aMaxSize.height);
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aBandData.trapezoids[0].state = nsBandTrapezoid::Available;
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aBandData.trapezoids[0].frame = nsnull;
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} else {
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// Find the first band that contains the y-offset or is below the y-offset
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NS_ASSERTION(!mBandList.IsEmpty(), "no bands");
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BandRect* band = mBandList.Head();
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aBandData.count = 0;
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while (nsnull != band) {
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if (band->top > y) {
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// The band is below the y-offset. The area between the y-offset and
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// the top of the band is available
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aBandData.count = 1;
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aBandData.trapezoids[0] =
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nsRect(0, aYOffset, aMaxSize.width, PR_MIN(band->top - y, aMaxSize.height));
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aBandData.trapezoids[0].state = nsBandTrapezoid::Available;
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aBandData.trapezoids[0].frame = nsnull;
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break;
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} else if (y < band->bottom) {
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// The band contains the y-offset. Return a list of available and
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// unavailable rects within the band
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return GetBandAvailableSpace(band, y, aMaxSize, aBandData);
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} else {
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// Skip to the next band
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band = GetNextBand(band);
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}
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}
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}
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NS_POSTCONDITION(aBandData.count > 0, "unexpected band data count");
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return result;
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}
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/**
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* Skips to the start of the next band.
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*
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* @param aBandRect A rect within the band
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* @returns The start of the next band, or nsnull of this is the last band.
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*/
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nsSpaceManager::BandRect*
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nsSpaceManager::GetNextBand(const BandRect* aBandRect) const
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{
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nscoord topOfBand = aBandRect->top;
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aBandRect = aBandRect->Next();
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while (aBandRect != &mBandList) {
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// Check whether this rect is part of the same band
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if (aBandRect->top != topOfBand) {
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// We found the start of the next band
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return (BandRect*)aBandRect;
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}
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aBandRect = aBandRect->Next();
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}
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// No bands left
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return nsnull;
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}
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/**
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* Divides the current band into two vertically
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*
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* @param aBandRect the first rect in the band
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* @param aBottom where to split the band. This becomes the bottom of the top
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* part
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*/
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void
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nsSpaceManager::DivideBand(BandRect* aBandRect, nscoord aBottom)
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{
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NS_PRECONDITION(aBottom < aBandRect->bottom, "bad height");
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nscoord topOfBand = aBandRect->top;
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BandRect* nextBand = GetNextBand(aBandRect);
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if (nsnull == nextBand) {
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nextBand = (BandRect*)&mBandList;
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}
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while (topOfBand == aBandRect->top) {
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// Split the band rect into two vertically
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BandRect* bottomBandRect = aBandRect->SplitVertically(aBottom);
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// Insert the new bottom part
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nextBand->InsertBefore(bottomBandRect);
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// Move to the next rect in the band
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aBandRect = aBandRect->Next();
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}
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}
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PRBool
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nsSpaceManager::CanJoinBands(BandRect* aBand, BandRect* aPrevBand)
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{
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PRBool result;
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nscoord topOfBand = aBand->top;
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nscoord topOfPrevBand = aPrevBand->top;
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// The bands can be joined if:
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// - they're adjacent
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// - they have the same number of rects
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// - each rect has the same left and right edge as its corresponding rect, and
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// the rects are occupied by the same frames
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if (aPrevBand->bottom == aBand->top) {
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// Compare each of the rects in the two bands
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while (PR_TRUE) {
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if ((aBand->left != aPrevBand->left) || (aBand->right != aPrevBand->right)) {
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// The rects have different edges
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result = PR_FALSE;
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break;
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}
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if (!aBand->HasSameFrameList(aPrevBand)) {
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// The rects are occupied by different frames
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result = PR_FALSE;
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break;
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}
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// Move to the next rects within the bands
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aBand = aBand->Next();
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aPrevBand = aPrevBand->Next();
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// Have we reached the end of either band?
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PRBool endOfBand = aBand->top != topOfBand;
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PRBool endOfPrevBand = aPrevBand->top != topOfPrevBand;
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if (endOfBand || endOfPrevBand) {
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result = endOfBand & endOfPrevBand;
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break; // all done
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}
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}
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} else {
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// The bands aren't adjacent
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result = PR_FALSE;
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}
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return result;
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}
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/**
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* Tries to join the two adjacent bands. Returns PR_TRUE if successful and
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* PR_FALSE otherwise
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*
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* If the two bands are joined, the previous band is the the band that's deleted
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*/
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PRBool
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nsSpaceManager::JoinBands(BandRect* aBand, BandRect* aPrevBand)
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{
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if (CanJoinBands(aBand, aPrevBand)) {
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BandRect* startOfNextBand = aBand;
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while (aPrevBand != startOfNextBand) {
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// Adjust the top of the band we're keeping, and then move to the next
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// rect within the band
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aBand->top = aPrevBand->top;
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aBand = aBand->Next();
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// Delete the rect from the previous band
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BandRect* next = aPrevBand->Next();
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aPrevBand->Remove();
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delete aPrevBand;
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aPrevBand = next;
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}
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return PR_TRUE;
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}
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return PR_FALSE;
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}
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/**
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* Adds a new rect to a band.
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*
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* @param aBand the first rect in the band
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* @param aBandRect the band rect to add to the band
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*/
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void
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nsSpaceManager::AddRectToBand(BandRect* aBand, BandRect* aBandRect)
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{
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NS_PRECONDITION((aBand->top == aBandRect->top) &&
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(aBand->bottom == aBandRect->bottom), "bad band");
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NS_PRECONDITION(1 == aBandRect->numFrames, "shared band rect");
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nscoord topOfBand = aBand->top;
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// Figure out where in the band horizontally to insert the rect
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do {
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// Compare the left edge of the new rect with the left edge of the existing
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// rect
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if (aBandRect->left < aBand->left) {
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// The new rect's left edge is to the left of the existing rect's left edge.
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// Could be any of these cases (N is new rect, E is existing rect):
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//
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// Case 1: left-of Case 2: overlaps Case 3: N.contains(E)
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// --------------- ---------------- ---------------------
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// +-----+ +-----+ +-----+ +---------+
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// | N | | E | | N | | N |
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// +-----+ +-----+ +-----+ +---------+
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// +-----+ +---+
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// | E | | E |
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// +-----+ +---+
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//
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// Do the two rectangles overlap?
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if (aBandRect->right <= aBand->left) {
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// No, the new rect is completely to the left of the existing rect
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// (case #1). Insert a new rect
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aBand->InsertBefore(aBandRect);
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return;
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}
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// Yes, they overlap. Compare the right edges.
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if (aBandRect->right > aBand->right) {
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// The new rect's right edge is to the right of the existing rect's
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|
// right edge (case #3). Split the new rect
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BandRect* r1 = aBandRect->SplitHorizontally(aBand->left);
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// Insert the part of the new rect that's to the left of the existing
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|
// rect as a new band rect
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aBand->InsertBefore(aBandRect);
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// Continue below with the part that overlaps the existing rect
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aBandRect = r1;
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} else {
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if (aBand->right > aBandRect->right) {
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// The existing rect extends past the new rect (case #2). Split the
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// existing rect
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BandRect* r1 = aBand->SplitHorizontally(aBandRect->right);
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// Insert the new right half of the existing rect
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aBand->InsertAfter(r1);
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}
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// Insert the part of the new rect that's to the left of the existing
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// rect
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aBandRect->right = aBand->left;
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aBand->InsertBefore(aBandRect);
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// Mark the existing rect as shared
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aBand->AddFrame(aBandRect->frame);
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return;
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}
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}
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|
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if (aBandRect->left > aBand->left) {
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// The new rect's left edge is to the right of the existing rect's left
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// edge. Could be any one of these cases:
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//
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|
// Case 4: right-of Case 5: overlaps Case 6: E.Contains(N)
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|
// --------------- ---------------- ---------------------
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|
// +-----+ +-----+ +-----+ +------------+
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// | E | | N | | E | | E |
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// +-----+ +-----+ +-----+ +------------+
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// +-----+ +-----+
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// | N | | N |
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// +-----+ +-----+
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//
|
|
if (aBandRect->left >= aBand->right) {
|
|
// The new rect is to the right of the existing rect (case #4), so move
|
|
// to the next rect in the band
|
|
aBand = aBand->Next();
|
|
continue;
|
|
}
|
|
|
|
// The rects overlap, so divide the existing rect into two rects: the
|
|
// part to the left of the new rect, and the part that overlaps
|
|
BandRect* r1 = aBand->SplitHorizontally(aBandRect->left);
|
|
|
|
// Insert the new right half of the existing rect, and make it the current
|
|
// rect
|
|
aBand->InsertAfter(r1);
|
|
aBand = r1;
|
|
}
|
|
|
|
// At this point the left edge of the new rect is the same as the left edge
|
|
// of the existing rect
|
|
NS_ASSERTION(aBandRect->left == aBand->left, "unexpected rect");
|
|
|
|
// Compare which rect is wider, the new rect or the existing rect
|
|
if (aBand->right > aBandRect->right) {
|
|
// The existing rect is wider (case #6). Divide the existing rect into
|
|
// two rects: the part that overlaps, and the part to the right of the
|
|
// new rect
|
|
BandRect* r1 = aBand->SplitHorizontally(aBandRect->right);
|
|
|
|
// Insert the new right half of the existing rect
|
|
aBand->InsertAfter(r1);
|
|
|
|
// Mark the overlap as being shared
|
|
aBand->AddFrame(aBandRect->frame);
|
|
return;
|
|
|
|
} else {
|
|
// Indicate the frames share the existing rect
|
|
aBand->AddFrame(aBandRect->frame);
|
|
|
|
if (aBand->right == aBandRect->right) {
|
|
// The new and existing rect have the same right edge. We're all done,
|
|
// and the new band rect is no longer needed
|
|
delete aBandRect;
|
|
return;
|
|
} else {
|
|
// The new rect is wider than the existing rect (cases #5). Set the
|
|
// new rect to be the overhang, and move to the next rect within the band
|
|
aBandRect->left = aBand->right;
|
|
aBand = aBand->Next();
|
|
continue;
|
|
}
|
|
}
|
|
} while (aBand->top == topOfBand);
|
|
|
|
// Insert a new rect
|
|
aBand->InsertBefore(aBandRect);
|
|
}
|
|
|
|
// When comparing a rect to a band there are seven cases to consider.
|
|
// 'R' is the rect and 'B' is the band.
|
|
//
|
|
// Case 1 Case 2 Case 3 Case 4
|
|
// ------ ------ ------ ------
|
|
// +-----+ +-----+ +-----+ +-----+
|
|
// | R | | R | +-----+ +-----+ | | | |
|
|
// +-----+ +-----+ | | | R | | B | | B |
|
|
// +-----+ | B | +-----+ | | +-----+ | |
|
|
// | | | | +-----+ | R | +-----+
|
|
// | B | +-----+ +-----+
|
|
// | |
|
|
// +-----+
|
|
//
|
|
//
|
|
//
|
|
// Case 5 Case 6 Case 7
|
|
// ------ ------ ------
|
|
// +-----+ +-----+ +-----+ +-----+
|
|
// | | | R | | B | | | +-----+
|
|
// | B | +-----+ +-----+ | R | | B |
|
|
// | | | | +-----+
|
|
// +-----+ +-----+
|
|
// +-----+
|
|
// | R |
|
|
// +-----+
|
|
//
|
|
void
|
|
nsSpaceManager::InsertBandRect(BandRect* aBandRect)
|
|
{
|
|
// If there are no existing bands or this rect is below the bottommost
|
|
// band, then add a new band
|
|
nscoord yMost;
|
|
YMost(yMost);
|
|
if (aBandRect->top >= yMost) {
|
|
mBandList.Append(aBandRect);
|
|
return;
|
|
}
|
|
|
|
// Examine each band looking for a band that intersects this rect
|
|
NS_ASSERTION(!mBandList.IsEmpty(), "no bands");
|
|
BandRect* band = mBandList.Head();
|
|
|
|
while (nsnull != band) {
|
|
// Compare the top edge of this rect with the top edge of the band
|
|
if (aBandRect->top < band->top) {
|
|
// The top edge of the rect is above the top edge of the band.
|
|
// Is there any overlap?
|
|
if (aBandRect->bottom <= band->top) {
|
|
// Case #1. This rect is completely above the band, so insert a
|
|
// new band before the current band
|
|
band->InsertBefore(aBandRect);
|
|
break; // we're all done
|
|
}
|
|
|
|
// Case #2 and case #7. Divide this rect, creating a new rect for
|
|
// the part that's above the band
|
|
BandRect* bandRect1 = new BandRect(aBandRect->left, aBandRect->top,
|
|
aBandRect->right, band->top,
|
|
aBandRect->frame);
|
|
|
|
// Insert bandRect1 as a new band
|
|
band->InsertBefore(bandRect1);
|
|
|
|
// Modify this rect to exclude the part above the band
|
|
aBandRect->top = band->top;
|
|
|
|
} else if (aBandRect->top > band->top) {
|
|
// The top edge of the rect is below the top edge of the band. Is there
|
|
// any overlap?
|
|
if (aBandRect->top >= band->bottom) {
|
|
// Case #5. This rect is below the current band. Skip to the next band
|
|
band = GetNextBand(band);
|
|
continue;
|
|
}
|
|
|
|
// Case #3 and case #4. Divide the current band into two bands with the
|
|
// top band being the part that's above the rect
|
|
DivideBand(band, aBandRect->top);
|
|
|
|
// Skip to the bottom band that we just created
|
|
band = GetNextBand(band);
|
|
}
|
|
|
|
// At this point the rect and the band should have the same y-offset
|
|
NS_ASSERTION(aBandRect->top == band->top, "unexpected band");
|
|
|
|
// Is the band higher than the rect?
|
|
if (band->bottom > aBandRect->bottom) {
|
|
// Divide the band into two bands with the top band the same height
|
|
// as the rect
|
|
DivideBand(band, aBandRect->bottom);
|
|
}
|
|
|
|
if (aBandRect->bottom == band->bottom) {
|
|
// Add the rect to the band
|
|
AddRectToBand(band, aBandRect);
|
|
break;
|
|
|
|
} else {
|
|
// Case #4 and case #7. The rect contains the band vertically. Divide
|
|
// the rect, creating a new rect for the part that overlaps the band
|
|
BandRect* bandRect1 = new BandRect(aBandRect->left, aBandRect->top,
|
|
aBandRect->right, band->bottom,
|
|
aBandRect->frame);
|
|
|
|
// Add bandRect1 to the band
|
|
AddRectToBand(band, bandRect1);
|
|
|
|
// Modify aBandRect to be the part below the band
|
|
aBandRect->top = band->bottom;
|
|
|
|
// Continue with the next band
|
|
band = GetNextBand(band);
|
|
if (nsnull == band) {
|
|
// Append a new bottommost band
|
|
mBandList.Append(aBandRect);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsSpaceManager::AddRectRegion(nsIFrame* aFrame, const nsRect& aUnavailableSpace)
|
|
{
|
|
NS_PRECONDITION(nsnull != aFrame, "null frame");
|
|
|
|
// See if there is already a region associated with aFrame
|
|
FrameInfo* frameInfo = GetFrameInfoFor(aFrame);
|
|
|
|
if (nsnull != frameInfo) {
|
|
NS_WARNING("aFrame is already associated with a region");
|
|
return NS_ERROR_FAILURE;
|
|
}
|
|
|
|
// Convert the frame to world coordinates
|
|
nsRect rect(aUnavailableSpace.x + mX, aUnavailableSpace.y + mY,
|
|
aUnavailableSpace.width, aUnavailableSpace.height);
|
|
|
|
// Verify that the offset is within the defined coordinate space
|
|
if ((rect.x < 0) || (rect.y < 0)) {
|
|
NS_WARNING("invalid offset for rect region");
|
|
return NS_ERROR_INVALID_ARG;
|
|
}
|
|
|
|
// Create a frame info structure
|
|
frameInfo = CreateFrameInfo(aFrame, rect);
|
|
if (nsnull == frameInfo) {
|
|
return NS_ERROR_OUT_OF_MEMORY;
|
|
}
|
|
|
|
// Is the rect empty?
|
|
if (aUnavailableSpace.IsEmpty()) {
|
|
// The rect doesn't consume any space, so don't add any band data
|
|
return NS_OK;
|
|
}
|
|
|
|
// Allocate a band rect
|
|
BandRect* bandRect = new BandRect(rect.x, rect.y, rect.XMost(), rect.YMost(), aFrame);
|
|
if (nsnull == bandRect) {
|
|
return NS_ERROR_OUT_OF_MEMORY;
|
|
}
|
|
|
|
// Insert the band rect
|
|
InsertBandRect(bandRect);
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsSpaceManager::ResizeRectRegion(nsIFrame* aFrame,
|
|
nscoord aDeltaWidth,
|
|
nscoord aDeltaHeight,
|
|
AffectedEdge aEdge)
|
|
{
|
|
// Get the frame info associated with with aFrame
|
|
FrameInfo* frameInfo = GetFrameInfoFor(aFrame);
|
|
|
|
if (nsnull == frameInfo) {
|
|
NS_WARNING("no region associated with aFrame");
|
|
return NS_ERROR_INVALID_ARG;
|
|
}
|
|
|
|
// Compute new rect
|
|
nsRect rect(frameInfo->rect);
|
|
rect.SizeBy(aDeltaWidth, aDeltaHeight);
|
|
if (aEdge == LeftEdge) {
|
|
rect.x += aDeltaWidth;
|
|
}
|
|
|
|
// Verify that the offset is within the defined coordinate space
|
|
if ((rect.x < 0) || (rect.y < 0)) {
|
|
NS_WARNING("invalid offset when resizing rect region");
|
|
return NS_ERROR_FAILURE;
|
|
}
|
|
|
|
// For the time being just remove it and add it back in. Because
|
|
// AddRectRegion() operates relative to the local coordinate space,
|
|
// translate from world coordinates to the local coordinate space
|
|
rect.MoveBy(-mX, -mY);
|
|
RemoveRegion(aFrame);
|
|
return AddRectRegion(aFrame, rect);
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsSpaceManager::OffsetRegion(nsIFrame* aFrame, nscoord aDx, nscoord aDy)
|
|
{
|
|
// Get the frame info associated with with aFrame
|
|
FrameInfo* frameInfo = GetFrameInfoFor(aFrame);
|
|
|
|
if (nsnull == frameInfo) {
|
|
NS_WARNING("no region associated with aFrame");
|
|
return NS_ERROR_INVALID_ARG;
|
|
}
|
|
|
|
// Compute new rect
|
|
nsRect rect(frameInfo->rect);
|
|
rect.MoveBy(aDx, aDy);
|
|
|
|
// Verify that the offset is within the defined coordinate space
|
|
if ((rect.x < 0) || (rect.y < 0)) {
|
|
NS_WARNING("invalid offset when offseting rect region");
|
|
return NS_ERROR_FAILURE;
|
|
}
|
|
|
|
// For the time being just remove it and add it back in. Because
|
|
// AddRectRegion() operates relative to the local coordinate space,
|
|
// translate from world coordinates to the local coordinate space
|
|
rect.MoveBy(-mX, -mY);
|
|
RemoveRegion(aFrame);
|
|
return AddRectRegion(aFrame, rect);
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsSpaceManager::RemoveRegion(nsIFrame* aFrame)
|
|
{
|
|
// Get the frame info associated with aFrame
|
|
FrameInfo* frameInfo = GetFrameInfoFor(aFrame);
|
|
|
|
if (nsnull == frameInfo) {
|
|
NS_WARNING("no region associated with aFrame");
|
|
return NS_ERROR_INVALID_ARG;
|
|
}
|
|
|
|
if (!frameInfo->rect.IsEmpty()) {
|
|
NS_ASSERTION(!mBandList.IsEmpty(), "no bands");
|
|
BandRect* band = mBandList.Head();
|
|
BandRect* prevBand = nsnull;
|
|
PRBool prevFoundMatchingRect = PR_FALSE;
|
|
|
|
// Iterate each band looking for rects tagged with aFrame
|
|
while (nsnull != band) {
|
|
BandRect* rect = band;
|
|
BandRect* prevRect = nsnull;
|
|
nscoord topOfBand = band->top;
|
|
PRBool foundMatchingRect = PR_FALSE;
|
|
PRBool prevIsSharedRect = PR_FALSE;
|
|
|
|
// Iterate each rect in the band
|
|
do {
|
|
PRBool isSharedRect = PR_FALSE;
|
|
|
|
if (rect->IsOccupiedBy(aFrame)) {
|
|
// Remember that we found a matching rect in this band
|
|
foundMatchingRect = PR_TRUE;
|
|
|
|
if (rect->numFrames > 1) {
|
|
// The band rect is occupied by more than one frame
|
|
rect->RemoveFrame(aFrame);
|
|
|
|
// Remember that this rect was being shared by more than one frame
|
|
// including aFrame
|
|
isSharedRect = PR_TRUE;
|
|
} else {
|
|
// The rect isn't shared so just delete it
|
|
BandRect* next = rect->Next();
|
|
rect->Remove();
|
|
if (rect == band) {
|
|
// The rect we're deleting is the start of the band
|
|
if (topOfBand == next->top) {
|
|
band = next;
|
|
} else {
|
|
band = nsnull;
|
|
}
|
|
}
|
|
delete rect;
|
|
rect = next;
|
|
|
|
// We don't need to try and coalesce adjacent rects in this case
|
|
prevRect = nsnull;
|
|
prevIsSharedRect = PR_FALSE;
|
|
continue;
|
|
}
|
|
}
|
|
|
|
// If we found a shared rect occupied by aFrame, then we need to try
|
|
// and coalesce adjacent rects
|
|
if (prevIsSharedRect || (isSharedRect && (nsnull != prevRect))) {
|
|
NS_ASSERTION(nsnull != prevRect, "no previous rect");
|
|
if ((prevRect->right == rect->left) && (prevRect->HasSameFrameList(rect))) {
|
|
// Modify the current rect's left edge, and delete the previous rect
|
|
rect->left = prevRect->left;
|
|
prevRect->Remove();
|
|
if (prevRect == band) {
|
|
// the rect we're deleting is the start of the band
|
|
band = rect;
|
|
}
|
|
delete prevRect;
|
|
}
|
|
}
|
|
|
|
// Get the next rect in the band
|
|
prevRect = rect;
|
|
prevIsSharedRect = isSharedRect;
|
|
rect = rect->Next();
|
|
} while (rect->top == topOfBand);
|
|
|
|
if (nsnull != band) {
|
|
// If we found a rect occupied by aFrame in this band or the previous band
|
|
// then try to join the two bands
|
|
if ((nsnull != prevBand) && (foundMatchingRect || prevFoundMatchingRect)) {
|
|
// Try and join this band with the previous band
|
|
JoinBands(band, prevBand);
|
|
}
|
|
}
|
|
|
|
// Move to the next band
|
|
prevFoundMatchingRect = foundMatchingRect;
|
|
prevBand = band;
|
|
band = (rect == &mBandList) ? nsnull : rect;
|
|
}
|
|
}
|
|
|
|
DestroyFrameInfo(frameInfo);
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsSpaceManager::ClearRegions()
|
|
{
|
|
ClearFrameInfo();
|
|
mBandList.Clear();
|
|
return NS_OK;
|
|
}
|
|
|
|
nsSpaceManager::FrameInfo*
|
|
nsSpaceManager::GetFrameInfoFor(nsIFrame* aFrame)
|
|
{
|
|
FrameInfo* result = nsnull;
|
|
|
|
if (nsnull != mFrameInfoMap) {
|
|
result = (FrameInfo*)PL_HashTableLookup(mFrameInfoMap, (const void*)aFrame);
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
nsSpaceManager::FrameInfo*
|
|
nsSpaceManager::CreateFrameInfo(nsIFrame* aFrame, const nsRect& aRect)
|
|
{
|
|
if (nsnull == mFrameInfoMap) {
|
|
mFrameInfoMap = PL_NewHashTable(17, NS_HashNumber, PL_CompareValues,
|
|
PL_CompareValues, nsnull, nsnull);
|
|
if (nsnull == mFrameInfoMap) {
|
|
return nsnull;
|
|
}
|
|
}
|
|
|
|
FrameInfo* frameInfo = new FrameInfo(aFrame, aRect);
|
|
if (nsnull != frameInfo) {
|
|
PL_HashTableAdd(mFrameInfoMap, (const void*)aFrame, frameInfo);
|
|
}
|
|
return frameInfo;
|
|
}
|
|
|
|
void
|
|
nsSpaceManager::DestroyFrameInfo(FrameInfo* aFrameInfo)
|
|
{
|
|
PL_HashTableRemove(mFrameInfoMap, (const void*)aFrameInfo->frame);
|
|
delete aFrameInfo;
|
|
}
|
|
|
|
/////////////////////////////////////////////////////////////////////////////
|
|
// FrameInfo
|
|
|
|
nsSpaceManager::FrameInfo::FrameInfo(nsIFrame* aFrame, const nsRect& aRect)
|
|
: frame(aFrame), rect(aRect)
|
|
{
|
|
}
|
|
|
|
/////////////////////////////////////////////////////////////////////////////
|
|
// BandRect
|
|
|
|
nsSpaceManager::BandRect::BandRect(nscoord aLeft,
|
|
nscoord aTop,
|
|
nscoord aRight,
|
|
nscoord aBottom,
|
|
nsIFrame* aFrame)
|
|
{
|
|
left = aLeft;
|
|
top = aTop;
|
|
right = aRight;
|
|
bottom = aBottom;
|
|
frame = aFrame;
|
|
numFrames = 1;
|
|
}
|
|
|
|
nsSpaceManager::BandRect::BandRect(nscoord aLeft,
|
|
nscoord aTop,
|
|
nscoord aRight,
|
|
nscoord aBottom,
|
|
nsVoidArray* aFrames)
|
|
{
|
|
left = aLeft;
|
|
top = aTop;
|
|
right = aRight;
|
|
bottom = aBottom;
|
|
frames = new nsVoidArray;
|
|
frames->operator=(*aFrames);
|
|
numFrames = frames->Count();
|
|
}
|
|
|
|
nsSpaceManager::BandRect::~BandRect()
|
|
{
|
|
if (numFrames > 1) {
|
|
delete frames;
|
|
}
|
|
}
|
|
|
|
nsSpaceManager::BandRect*
|
|
nsSpaceManager::BandRect::SplitVertically(nscoord aBottom)
|
|
{
|
|
NS_PRECONDITION((aBottom > top) && (aBottom < bottom), "bad argument");
|
|
|
|
// Create a new band rect for the bottom part
|
|
BandRect* bottomBandRect;
|
|
|
|
if (numFrames > 1) {
|
|
bottomBandRect = new BandRect(left, aBottom, right, bottom, frames);
|
|
} else {
|
|
bottomBandRect = new BandRect(left, aBottom, right, bottom, frame);
|
|
}
|
|
|
|
// This band rect becomes the top part, so adjust the bottom edge
|
|
bottom = aBottom;
|
|
return bottomBandRect;
|
|
}
|
|
|
|
nsSpaceManager::BandRect*
|
|
nsSpaceManager::BandRect::SplitHorizontally(nscoord aRight)
|
|
{
|
|
NS_PRECONDITION((aRight > left) && (aRight < right), "bad argument");
|
|
|
|
// Create a new band rect for the right part
|
|
BandRect* rightBandRect;
|
|
|
|
if (numFrames > 1) {
|
|
rightBandRect = new BandRect(aRight, top, right, bottom, frames);
|
|
} else {
|
|
rightBandRect = new BandRect(aRight, top, right, bottom, frame);
|
|
}
|
|
|
|
// This band rect becomes the left part, so adjust the right edge
|
|
right = aRight;
|
|
return rightBandRect;
|
|
}
|
|
|
|
PRBool
|
|
nsSpaceManager::BandRect::IsOccupiedBy(const nsIFrame* aFrame) const
|
|
{
|
|
PRBool result;
|
|
|
|
if (1 == numFrames) {
|
|
result = (frame == aFrame);
|
|
} else {
|
|
PRInt32 count = frames->Count();
|
|
|
|
result = PR_FALSE;
|
|
for (PRInt32 i = 0; i < count; i++) {
|
|
nsIFrame* f = (nsIFrame*)frames->ElementAt(i);
|
|
|
|
if (f == aFrame) {
|
|
result = PR_TRUE;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
void
|
|
nsSpaceManager::BandRect::AddFrame(const nsIFrame* aFrame)
|
|
{
|
|
if (1 == numFrames) {
|
|
nsIFrame* f = frame;
|
|
frames = new nsVoidArray;
|
|
frames->AppendElement(f);
|
|
}
|
|
|
|
numFrames++;
|
|
frames->AppendElement((void*)aFrame);
|
|
NS_POSTCONDITION(frames->Count() == numFrames, "bad frame count");
|
|
}
|
|
|
|
void
|
|
nsSpaceManager::BandRect::RemoveFrame(const nsIFrame* aFrame)
|
|
{
|
|
NS_PRECONDITION(numFrames > 1, "only one frame");
|
|
frames->RemoveElement((void*)aFrame);
|
|
numFrames--;
|
|
|
|
if (1 == numFrames) {
|
|
nsIFrame* f = (nsIFrame*)frames->ElementAt(0);
|
|
|
|
delete frames;
|
|
frame = f;
|
|
}
|
|
}
|
|
|
|
PRBool
|
|
nsSpaceManager::BandRect::HasSameFrameList(const BandRect* aBandRect) const
|
|
{
|
|
PRBool result;
|
|
|
|
// Check whether they're occupied by the same number of frames
|
|
if (numFrames != aBandRect->numFrames) {
|
|
result = PR_FALSE;
|
|
} else if (1 == numFrames) {
|
|
result = frame == aBandRect->frame;
|
|
} else {
|
|
result = PR_TRUE;
|
|
|
|
// For each frame occupying this band rect check whether it also occupies
|
|
// aBandRect
|
|
PRInt32 count = frames->Count();
|
|
for (PRInt32 i = 0; i < count; i++) {
|
|
nsIFrame* f = (nsIFrame*)frames->ElementAt(i);
|
|
|
|
if (-1 == aBandRect->frames->IndexOf(f)) {
|
|
result = PR_FALSE;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* Internal helper function that counts the number of rects in this band
|
|
* including the current band rect
|
|
*/
|
|
PRInt32
|
|
nsSpaceManager::BandRect::Length() const
|
|
{
|
|
nscoord topOfBand = top;
|
|
PRInt32 len = 1;
|
|
BandRect* bandRect = Next();
|
|
|
|
// Because there's a header cell we know we'll either find the next band
|
|
// (which has a different y-offset) or the header cell which has an invalid
|
|
// y-offset
|
|
while (bandRect->top == top) {
|
|
len++;
|
|
bandRect = bandRect->Next();
|
|
}
|
|
|
|
return len;
|
|
}
|
|
|