mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-11-01 14:45:29 +00:00
385 lines
10 KiB
C++
385 lines
10 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "mozilla/dom/ScrollBoxObject.h"
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#include "mozilla/dom/ScrollBoxObjectBinding.h"
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#include "mozilla/dom/Element.h"
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#include "mozilla/dom/ToJSValue.h"
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#include "nsCOMPtr.h"
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#include "nsIPresShell.h"
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#include "nsIContent.h"
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#include "nsIDOMElement.h"
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#include "nsPresContext.h"
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#include "nsBox.h"
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#include "nsIScrollableFrame.h"
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namespace mozilla {
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namespace dom {
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ScrollBoxObject::ScrollBoxObject()
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{
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}
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ScrollBoxObject::~ScrollBoxObject()
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{
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}
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JSObject* ScrollBoxObject::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto)
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{
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return ScrollBoxObjectBinding::Wrap(aCx, this, aGivenProto);
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}
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nsIScrollableFrame* ScrollBoxObject::GetScrollFrame()
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{
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return do_QueryFrame(GetFrame(false));
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}
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void ScrollBoxObject::ScrollTo(int32_t x, int32_t y, ErrorResult& aRv)
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{
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nsIScrollableFrame* sf = GetScrollFrame();
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if (!sf) {
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aRv.Throw(NS_ERROR_FAILURE);
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return;
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}
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sf->ScrollToCSSPixels(CSSIntPoint(x, y));
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}
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void ScrollBoxObject::ScrollBy(int32_t dx, int32_t dy, ErrorResult& aRv)
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{
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CSSIntPoint pt;
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GetPosition(pt, aRv);
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if (aRv.Failed()) {
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return;
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}
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ScrollTo(pt.x + dx, pt.y + dy, aRv);
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}
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void ScrollBoxObject::ScrollByLine(int32_t dlines, ErrorResult& aRv)
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{
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nsIScrollableFrame* sf = GetScrollFrame();
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if (!sf) {
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aRv.Throw(NS_ERROR_FAILURE);
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return;
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}
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sf->ScrollBy(nsIntPoint(0, dlines), nsIScrollableFrame::LINES,
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nsIScrollableFrame::SMOOTH);
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}
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// XUL <scrollbox> elements have a single box child element.
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// Get a pointer to that box.
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// Note that now that the <scrollbox> is just a regular box
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// with 'overflow:hidden', the boxobject's frame is an nsXULScrollFrame,
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// the <scrollbox>'s box frame is the scrollframe's "scrolled frame", and
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// the <scrollbox>'s child box is a child of that.
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static nsIFrame* GetScrolledBox(BoxObject* aScrollBox) {
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nsIFrame* frame = aScrollBox->GetFrame(false);
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if (!frame) {
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return nullptr;
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}
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nsIScrollableFrame* scrollFrame = do_QueryFrame(frame);
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if (!scrollFrame) {
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NS_WARNING("ScrollBoxObject attached to something that's not a scroll frame!");
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return nullptr;
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}
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nsIFrame* scrolledFrame = scrollFrame->GetScrolledFrame();
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if (!scrolledFrame)
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return nullptr;
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return nsBox::GetChildBox(scrolledFrame);
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}
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void ScrollBoxObject::ScrollByIndex(int32_t dindexes, ErrorResult& aRv)
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{
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nsIScrollableFrame* sf = GetScrollFrame();
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if (!sf) {
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aRv.Throw(NS_ERROR_FAILURE);
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return;
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}
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nsIFrame* scrolledBox = GetScrolledBox(this);
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if (!scrolledBox) {
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aRv.Throw(NS_ERROR_FAILURE);
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return;
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}
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nsRect rect;
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// now get the scrolled boxes first child.
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nsIFrame* child = nsBox::GetChildBox(scrolledBox);
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bool horiz = scrolledBox->IsHorizontal();
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nsPoint cp = sf->GetScrollPosition();
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nscoord diff = 0;
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int32_t curIndex = 0;
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bool isLTR = scrolledBox->IsNormalDirection();
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int32_t frameWidth = 0;
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if (!isLTR && horiz) {
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GetWidth(&frameWidth);
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nsCOMPtr<nsIPresShell> shell = GetPresShell(false);
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if (!shell) {
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aRv.Throw(NS_ERROR_UNEXPECTED);
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return;
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}
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frameWidth = nsPresContext::CSSPixelsToAppUnits(frameWidth);
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}
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// first find out what index we are currently at
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while(child) {
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rect = child->GetRect();
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if (horiz) {
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// In the left-to-right case we break from the loop when the center of
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// the current child rect is greater than the scrolled position of
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// the left edge of the scrollbox
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// In the right-to-left case we break when the center of the current
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// child rect is less than the scrolled position of the right edge of
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// the scrollbox.
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diff = rect.x + rect.width/2; // use the center, to avoid rounding errors
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if ((isLTR && diff > cp.x) ||
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(!isLTR && diff < cp.x + frameWidth)) {
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break;
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}
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} else {
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diff = rect.y + rect.height/2;// use the center, to avoid rounding errors
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if (diff > cp.y) {
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break;
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}
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}
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child = nsBox::GetNextBox(child);
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curIndex++;
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}
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int32_t count = 0;
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if (dindexes == 0)
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return;
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if (dindexes > 0) {
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while(child) {
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child = nsBox::GetNextBox(child);
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if (child) {
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rect = child->GetRect();
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}
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count++;
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if (count >= dindexes) {
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break;
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}
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}
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} else if (dindexes < 0) {
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child = nsBox::GetChildBox(scrolledBox);
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while(child) {
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rect = child->GetRect();
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if (count >= curIndex + dindexes) {
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break;
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}
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count++;
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child = nsBox::GetNextBox(child);
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}
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}
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nscoord csspixel = nsPresContext::CSSPixelsToAppUnits(1);
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if (horiz) {
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// In the left-to-right case we scroll so that the left edge of the
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// selected child is scrolled to the left edge of the scrollbox.
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// In the right-to-left case we scroll so that the right edge of the
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// selected child is scrolled to the right edge of the scrollbox.
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nsPoint pt(isLTR ? rect.x : rect.x + rect.width - frameWidth,
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cp.y);
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// Use a destination range that ensures the left edge (or right edge,
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// for RTL) will indeed be visible. Also ensure that the top edge
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// is visible.
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nsRect range(pt.x, pt.y, csspixel, 0);
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if (isLTR) {
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range.x -= csspixel;
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}
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sf->ScrollTo(pt, nsIScrollableFrame::INSTANT, &range);
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} else {
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// Use a destination range that ensures the top edge will be visible.
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nsRect range(cp.x, rect.y - csspixel, 0, csspixel);
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sf->ScrollTo(nsPoint(cp.x, rect.y), nsIScrollableFrame::INSTANT, &range);
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}
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}
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void ScrollBoxObject::ScrollToLine(int32_t line, ErrorResult& aRv)
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{
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nsIScrollableFrame* sf = GetScrollFrame();
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if (!sf) {
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aRv.Throw(NS_ERROR_FAILURE);
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return;
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}
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nscoord y = sf->GetLineScrollAmount().height * line;
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nsRect range(0, y - nsPresContext::CSSPixelsToAppUnits(1),
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0, nsPresContext::CSSPixelsToAppUnits(1));
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sf->ScrollTo(nsPoint(0, y), nsIScrollableFrame::INSTANT, &range);
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}
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void ScrollBoxObject::ScrollToElement(Element& child, ErrorResult& aRv)
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{
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nsCOMPtr<nsIPresShell> shell = GetPresShell(false);
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if (!shell) {
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aRv.Throw(NS_ERROR_UNEXPECTED);
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return;
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}
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shell->ScrollContentIntoView(&child,
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nsIPresShell::ScrollAxis(
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nsIPresShell::SCROLL_TOP,
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nsIPresShell::SCROLL_ALWAYS),
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nsIPresShell::ScrollAxis(
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nsIPresShell::SCROLL_LEFT,
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nsIPresShell::SCROLL_ALWAYS),
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nsIPresShell::SCROLL_FIRST_ANCESTOR_ONLY |
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nsIPresShell::SCROLL_OVERFLOW_HIDDEN);
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}
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void ScrollBoxObject::ScrollToIndex(int32_t index, ErrorResult& aRv)
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{
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aRv.Throw(NS_ERROR_NOT_IMPLEMENTED);
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}
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int32_t ScrollBoxObject::GetPositionX(ErrorResult& aRv)
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{
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CSSIntPoint pt;
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GetPosition(pt, aRv);
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return pt.x;
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}
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int32_t ScrollBoxObject::GetPositionY(ErrorResult& aRv)
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{
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CSSIntPoint pt;
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GetPosition(pt, aRv);
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return pt.y;
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}
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int32_t ScrollBoxObject::GetScrolledWidth(ErrorResult& aRv)
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{
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nsRect scrollRect;
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GetScrolledSize(scrollRect, aRv);
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return scrollRect.width;
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}
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int32_t ScrollBoxObject::GetScrolledHeight(ErrorResult& aRv)
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{
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nsRect scrollRect;
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GetScrolledSize(scrollRect, aRv);
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return scrollRect.height;
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}
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/* private helper */
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void ScrollBoxObject::GetPosition(CSSIntPoint& aPos, ErrorResult& aRv)
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{
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nsIScrollableFrame* sf = GetScrollFrame();
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if (!sf) {
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aRv.Throw(NS_ERROR_FAILURE);
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return;
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}
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aPos = sf->GetScrollPositionCSSPixels();
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}
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/* private helper */
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void ScrollBoxObject::GetScrolledSize(nsRect& aRect, ErrorResult& aRv)
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{
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nsIFrame* scrolledBox = GetScrolledBox(this);
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if (!scrolledBox) {
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aRv.Throw(NS_ERROR_FAILURE);
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return;
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}
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aRect = scrolledBox->GetRect();
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aRect.width = nsPresContext::AppUnitsToIntCSSPixels(aRect.width);
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aRect.height = nsPresContext::AppUnitsToIntCSSPixels(aRect.height);
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}
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void ScrollBoxObject::GetPosition(JSContext* cx,
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JS::Handle<JSObject*> x,
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JS::Handle<JSObject*> y,
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ErrorResult& aRv)
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{
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CSSIntPoint pt;
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GetPosition(pt, aRv);
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JS::Rooted<JS::Value> v(cx);
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if (!ToJSValue(cx, pt.x, &v) ||
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!JS_SetProperty(cx, x, "value", v)) {
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aRv.Throw(NS_ERROR_XPC_CANT_SET_OUT_VAL);
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return;
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}
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if (!ToJSValue(cx, pt.y, &v) ||
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!JS_SetProperty(cx, y, "value", v)) {
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aRv.Throw(NS_ERROR_XPC_CANT_SET_OUT_VAL);
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return;
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}
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}
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void ScrollBoxObject::GetScrolledSize(JSContext* cx,
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JS::Handle<JSObject*> width,
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JS::Handle<JSObject*> height,
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ErrorResult& aRv)
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{
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nsRect rect;
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GetScrolledSize(rect, aRv);
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JS::Rooted<JS::Value> v(cx);
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if (!ToJSValue(cx, rect.width, &v) ||
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!JS_SetProperty(cx, width, "value", v)) {
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aRv.Throw(NS_ERROR_XPC_CANT_SET_OUT_VAL);
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return;
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}
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if (!ToJSValue(cx, rect.height, &v) ||
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!JS_SetProperty(cx, height, "value", v)) {
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aRv.Throw(NS_ERROR_XPC_CANT_SET_OUT_VAL);
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return;
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}
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}
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void ScrollBoxObject::EnsureElementIsVisible(Element& child, ErrorResult& aRv)
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{
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nsCOMPtr<nsIPresShell> shell = GetPresShell(false);
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if (!shell) {
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aRv.Throw(NS_ERROR_UNEXPECTED);
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return;
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}
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shell->ScrollContentIntoView(&child,
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nsIPresShell::ScrollAxis(),
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nsIPresShell::ScrollAxis(),
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nsIPresShell::SCROLL_FIRST_ANCESTOR_ONLY |
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nsIPresShell::SCROLL_OVERFLOW_HIDDEN);
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}
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void ScrollBoxObject::EnsureIndexIsVisible(int32_t index, ErrorResult& aRv)
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{
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aRv.Throw(NS_ERROR_NOT_IMPLEMENTED);
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}
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void ScrollBoxObject::EnsureLineIsVisible(int32_t line, ErrorResult& aRv)
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{
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aRv.Throw(NS_ERROR_NOT_IMPLEMENTED);
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}
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} // namespace dom
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} // namespace mozilla
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// Creation Routine ///////////////////////////////////////////////////////////////////////
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using namespace mozilla::dom;
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nsresult
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NS_NewScrollBoxObject(nsIBoxObject** aResult)
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{
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NS_ADDREF(*aResult = new ScrollBoxObject());
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return NS_OK;
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}
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