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gecko-dev/layout/tables/nsTableCellFrame.cpp
buster%netscape.com 51fe86ee79 fundemental overhaul of the BasicTableLayoutStrategy 
We now cache lots of useful info in the colframes
we now properly account for margins just as uniform cellspacing
1998-07-16 23:23:31 +00:00

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* The contents of this file are subject to the Netscape Public License
* Version 1.0 (the "NPL"); you may not use this file except in
* compliance with the NPL. You may obtain a copy of the NPL at
* http://www.mozilla.org/NPL/
*
* Software distributed under the NPL is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
* for the specific language governing rights and limitations under the
* NPL.
*
* The Initial Developer of this code under the NPL is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All Rights
* Reserved.
*/
#include "nsTableCellFrame.h"
#include "nsBodyFrame.h"
#include "nsIReflowCommand.h"
#include "nsIStyleContext.h"
#include "nsStyleConsts.h"
#include "nsIPresContext.h"
#include "nsIRenderingContext.h"
#include "nsCSSRendering.h"
#include "nsIContent.h"
#include "nsIContentDelegate.h"
#include "nsCSSLayout.h"
#include "nsHTMLValue.h"
#include "nsHTMLAtoms.h"
#include "nsHTMLIIDs.h"
#include "nsIPtr.h"
#include "nsIView.h"
// dependancy on content
#include "nsHTMLTagContent.h"
NS_DEF_PTR(nsIStyleContext);
const nsIID kTableCellFrameCID = NS_TABLECELLFRAME_CID;
#ifdef NS_DEBUG
static PRBool gsDebug = PR_FALSE;
static PRBool gsDebugNT = PR_FALSE;
//#define NOISY_STYLE
//#define NOISY_FLOW
#else
static const PRBool gsDebug = PR_FALSE;
static const PRBool gsDebugNT = PR_FALSE;
#endif
/**
*/
nsTableCellFrame::nsTableCellFrame(nsIContent* aContent,
nsIFrame* aParentFrame)
: nsContainerFrame(aContent, aParentFrame)
{
mRowSpan=1;
mColSpan=1;
mColIndex=0;
mPriorAvailWidth=0;
mDesiredSize.width=0;
mDesiredSize.height=0;
mMaxElementSize.width=0;
mMaxElementSize.height=0;
mPass1DesiredSize.width=0;
mPass1DesiredSize.height=0;
mPass1MaxElementSize.width=0;
mPass1MaxElementSize.height=0;
}
nsTableCellFrame::~nsTableCellFrame()
{
}
NS_METHOD nsTableCellFrame::Paint(nsIPresContext& aPresContext,
nsIRenderingContext& aRenderingContext,
const nsRect& aDirtyRect)
{
const nsStyleDisplay* disp =
(const nsStyleDisplay*)mStyleContext->GetStyleData(eStyleStruct_Display);
if (disp->mVisible) {
const nsStyleColor* myColor =
(const nsStyleColor*)mStyleContext->GetStyleData(eStyleStruct_Color);
const nsStyleSpacing* mySpacing =
(const nsStyleSpacing*)mStyleContext->GetStyleData(eStyleStruct_Spacing);
NS_ASSERTION(nsnull!=myColor, "bad style color");
NS_ASSERTION(nsnull!=mySpacing, "bad style spacing");
nsCSSRendering::PaintBackground(aPresContext, aRenderingContext, this,
aDirtyRect, mRect, *myColor);
nsCSSRendering::PaintBorder(aPresContext, aRenderingContext, this,
aDirtyRect, mRect, *mySpacing, 0);
}
// for debug...
if (nsIFrame::GetShowFrameBorders()) {
aRenderingContext.SetColor(NS_RGB(0,128,128));
aRenderingContext.DrawRect(0, 0, mRect.width, mRect.height);
}
PaintChildren(aPresContext, aRenderingContext, aDirtyRect);
return NS_OK;
}
/**
*
* Align the cell's child frame within the cell
*
**/
void nsTableCellFrame::VerticallyAlignChild(nsIPresContext* aPresContext)
{
const nsStyleSpacing* spacing =
(const nsStyleSpacing*)mStyleContext->GetStyleData(eStyleStruct_Spacing);
const nsStyleText* textStyle =
(const nsStyleText*)mStyleContext->GetStyleData(eStyleStruct_Text);
nsMargin borderPadding;
spacing->CalcBorderPaddingFor(this, borderPadding);
nscoord topInset = borderPadding.top;
nscoord bottomInset = borderPadding.bottom;
PRUint8 verticalAlignFlags = NS_STYLE_VERTICAL_ALIGN_MIDDLE;
if (textStyle->mVerticalAlign.GetUnit() == eStyleUnit_Enumerated) {
verticalAlignFlags = textStyle->mVerticalAlign.GetIntValue();
}
nscoord height = mRect.height;
nsRect kidRect;
mFirstChild->GetRect(kidRect);
nscoord childHeight = kidRect.height;
// Vertically align the child
nscoord kidYTop = 0;
switch (verticalAlignFlags)
{
case NS_STYLE_VERTICAL_ALIGN_BASELINE:
// Align the child's baseline at the max baseline
//kidYTop = aMaxAscent - kidAscent;
break;
case NS_STYLE_VERTICAL_ALIGN_TOP:
// Align the top of the child frame with the top of the box,
// minus the top padding
kidYTop = topInset;
break;
case NS_STYLE_VERTICAL_ALIGN_BOTTOM:
kidYTop = height - childHeight - bottomInset;
break;
default:
case NS_STYLE_VERTICAL_ALIGN_MIDDLE:
kidYTop = height/2 - childHeight/2;
}
mFirstChild->MoveTo(kidRect.x, kidYTop);
}
void nsTableCellFrame::CreatePsuedoFrame(nsIPresContext* aPresContext)
{
// Do we have a prev-in-flow?
if (nsnull == mPrevInFlow) {
// No, create a body pseudo frame
nsBodyFrame::NewFrame(&mFirstChild, mContent, this);
mChildCount = 1;
// Resolve style and set the style context
nsIStyleContext* styleContext =
aPresContext->ResolveStyleContextFor(mContent, this); // styleContext: ADDREF++
mFirstChild->SetStyleContext(aPresContext,styleContext);
NS_RELEASE(styleContext); // styleContext: ADDREF--
} else {
nsTableCellFrame* prevFrame = (nsTableCellFrame *)mPrevInFlow;
nsIFrame* prevPseudoFrame = prevFrame->mFirstChild;
NS_ASSERTION(prevFrame->ChildIsPseudoFrame(prevPseudoFrame), "bad previous pseudo-frame");
// Create a continuing column
nsIStyleContext* kidSC;
prevPseudoFrame->GetStyleContext(aPresContext, kidSC);
prevPseudoFrame->CreateContinuingFrame(*aPresContext, this, kidSC, mFirstChild);
NS_RELEASE(kidSC);
mChildCount = 1;
}
}
/*
* Should this be performanced tuned? This is called
* in resize/reflow. Maybe we should cache the table
* frame in the table cell frame.
*
*/
nsTableFrame* nsTableCellFrame::GetTableFrame()
{
nsIFrame* frame = nsnull;
nsresult result;
result = GetContentParent(frame); // Get RowFrame
if ((result == NS_OK) && (frame != nsnull))
frame->GetContentParent(frame); // Get RowGroupFrame
if ((result == NS_OK) && (frame != nsnull))
frame->GetContentParent(frame); // Get TableFrame
return (nsTableFrame*)frame;
}
/**
*/
NS_METHOD nsTableCellFrame::Reflow(nsIPresContext& aPresContext,
nsReflowMetrics& aDesiredSize,
const nsReflowState& aReflowState,
nsReflowStatus& aStatus)
{
#ifdef NS_DEBUG
//PreReflowCheck();
#endif
// Initialize out parameter
if (nsnull != aDesiredSize.maxElementSize) {
aDesiredSize.maxElementSize->width = 0;
aDesiredSize.maxElementSize->height = 0;
}
aStatus = NS_FRAME_COMPLETE;
if (PR_TRUE==gsDebug || PR_TRUE==gsDebugNT)
printf("%p nsTableCellFrame::Reflow: maxSize=%d,%d\n",
this, aReflowState.maxSize.width, aReflowState.maxSize.height);
mFirstContentOffset = mLastContentOffset = 0;
nsSize availSize(aReflowState.maxSize);
nsSize maxElementSize;
nsSize *pMaxElementSize = aDesiredSize.maxElementSize;
if (NS_UNCONSTRAINEDSIZE==aReflowState.maxSize.width)
pMaxElementSize = &maxElementSize;
nscoord x = 0;
// SEC: what about ascent and decent???
// Compute the insets (sum of border and padding)
const nsStyleSpacing* spacing =
(const nsStyleSpacing*)mStyleContext->GetStyleData(eStyleStruct_Spacing);
nsMargin borderPadding;
spacing->CalcBorderPaddingFor(this, borderPadding);
nscoord topInset = borderPadding.top;
nscoord rightInset = borderPadding.right;
nscoord bottomInset = borderPadding.bottom;
nscoord leftInset = borderPadding.left;
// Get the margin information, available space should
// be reduced accordingly
nsMargin margin(0,0,0,0);
nsTableFrame* tableFrame = GetTableFrame();
tableFrame->GetCellMarginData(this,margin);
mLastContentIsComplete = PR_TRUE;
// get frame, creating one if needed
if (nsnull==mFirstChild)
{
CreatePsuedoFrame(&aPresContext);
}
// reduce available space by insets, if we're in a constrained situation
if (NS_UNCONSTRAINEDSIZE!=availSize.width)
availSize.width -= leftInset+rightInset;
if (NS_UNCONSTRAINEDSIZE!=availSize.height)
availSize.height -= topInset+bottomInset+margin.top+margin.bottom;
// XXX Kipp added this hack
if (eReflowReason_Incremental == aReflowState.reason) {
// XXX We *must* do this otherwise incremental reflow that's
// passing through will not work right.
nsIFrame* next;
aReflowState.reflowCommand->GetNext(next);
}
// Try to reflow the child into the available space. It might not
// fit or might need continuing.
if (availSize.height < 0)
availSize.height = 1;
nsSize maxKidElementSize;
if (gsDebug==PR_TRUE)
printf(" nsTableCellFrame::ResizeReflow calling ReflowChild with availSize=%d,%d\n",
availSize.width, availSize.height);
nsReflowMetrics kidSize(pMaxElementSize);
kidSize.width=kidSize.height=kidSize.ascent=kidSize.descent=0;
SetPriorAvailWidth(aReflowState.maxSize.width);
nsReflowState kidReflowState(mFirstChild, aReflowState, availSize);
mFirstChild->WillReflow(aPresContext);
mFirstChild->MoveTo(leftInset, topInset);
aStatus = ReflowChild(mFirstChild, &aPresContext, kidSize, kidReflowState);
if (PR_TRUE==gsDebug || PR_TRUE==gsDebugNT)
{
if (nsnull!=pMaxElementSize)
printf(" %p cellFrame child returned desiredSize=%d,%d,\
and maxElementSize=%d,%d\n",
this, kidSize.width, kidSize.height,
pMaxElementSize->width, pMaxElementSize->height);
else
printf(" %p cellFrame child returned desiredSize=%d,%d,\
and maxElementSize=nsnull\n",
this, kidSize.width, kidSize.height);
}
// Set our last content offset based on the pseudo-frame
nsBodyFrame* bodyPseudoFrame = (nsBodyFrame*)mFirstChild;
mLastContentOffset = bodyPseudoFrame->GetLastContentOffset();
// Place the child
mFirstChild->SetRect(nsRect(leftInset, topInset,
kidSize.width, kidSize.height));
if (NS_FRAME_IS_NOT_COMPLETE(aStatus)) {
// If the child didn't finish layout then it means that it used
// up all of our available space (or needs us to split).
mLastContentIsComplete = PR_FALSE;
}
// Return our size and our result
// first, compute the height
// the height can be set w/o being restricted by aMaxSize.height
nscoord cellHeight = kidSize.height;
// NAV4 compatibility: only add insets if cell content was not 0 height
if (0!=kidSize.height)
cellHeight += topInset + bottomInset;
if (PR_TRUE==gsDebugNT)
printf(" %p cellFrame height set to %d from kidSize=%d and insets %d,%d\n",
this, cellHeight, kidSize.height, topInset, bottomInset);
// next determine the cell's width
nscoord cellWidth = kidSize.width; // at this point, we've factored in the cell's style attributes
// NAV4 compatibility: only add insets if cell content was not 0 width
if (0!=kidSize.width)
cellWidth += leftInset + rightInset; // factor in insets
// Nav4 hack for 0 width cells. If the cell has any content, it must have a desired width of at least 1
// see testcase "cellHeights.html"
/*
if (0==cellWidth)
{
PRInt32 childCount;
mFirstChild->ChildCount(childCount);
if (0!=childCount)
{
nsIFrame *grandChild;
mFirstChild->FirstChild(grandChild);
grandChild->ChildCount(childCount);
if (0!=childCount)
{
cellWidth=1;
if (nsnull!=aDesiredSize.maxElementSize && 0==pMaxElementSize->width)
pMaxElementSize->width=1;
}
}
}
*/
// end Nav4 hack for 0 width cells
// set the cell's desired size and max element size
aDesiredSize.width = cellWidth;
aDesiredSize.height = cellHeight;
aDesiredSize.ascent = topInset;
aDesiredSize.descent = bottomInset;
if (nsnull!=aDesiredSize.maxElementSize)
{
*aDesiredSize.maxElementSize = *pMaxElementSize;
// NAV4 compatibility: only add insets if cell content was not 0 min height
if (0!=pMaxElementSize->height)
aDesiredSize.maxElementSize->height += topInset + bottomInset;
// NAV4 compatibility: only add insets if cell content was not 0 min width
if (0!=pMaxElementSize->width)
aDesiredSize.maxElementSize->width += leftInset + rightInset;
}
SetDesiredSize(aDesiredSize);
if (nsnull!=aDesiredSize.maxElementSize)
SetMaxElementSize(*(aDesiredSize.maxElementSize));
if (PR_TRUE==gsDebug || PR_TRUE==gsDebugNT)
printf(" %p cellFrame returning aDesiredSize=%d,%d\n",
this, aDesiredSize.width, aDesiredSize.height);
#ifdef NS_DEBUG
//PostReflowCheck(result);
#endif
return NS_OK;
}
NS_METHOD
nsTableCellFrame::CreateContinuingFrame(nsIPresContext& aPresContext,
nsIFrame* aParent,
nsIStyleContext* aStyleContext,
nsIFrame*& aContinuingFrame)
{
nsTableCellFrame* cf = new nsTableCellFrame(mContent, aParent);
if (nsnull == cf) {
return NS_ERROR_OUT_OF_MEMORY;
}
PrepareContinuingFrame(aPresContext, aParent, aStyleContext, cf);
aContinuingFrame = cf;
return NS_OK;
}
/**
*
* Update the border style to map to the HTML border style
*
*/
void nsTableCellFrame::MapHTMLBorderStyle(nsIPresContext* aPresContext, nsStyleSpacing& aSpacingStyle, nscoord aBorderWidth)
{
nsStyleCoord width;
width.SetCoordValue(aBorderWidth);
aSpacingStyle.mBorder.SetTop(width);
aSpacingStyle.mBorder.SetLeft(width);
aSpacingStyle.mBorder.SetBottom(width);
aSpacingStyle.mBorder.SetRight(width);
aSpacingStyle.mBorderStyle[NS_SIDE_TOP] = NS_STYLE_BORDER_STYLE_SOLID;
aSpacingStyle.mBorderStyle[NS_SIDE_LEFT] = NS_STYLE_BORDER_STYLE_SOLID;
aSpacingStyle.mBorderStyle[NS_SIDE_BOTTOM] = NS_STYLE_BORDER_STYLE_SOLID;
aSpacingStyle.mBorderStyle[NS_SIDE_RIGHT] = NS_STYLE_BORDER_STYLE_SOLID;
nsTableFrame* tableFrame = GetTableFrame();
nsIStyleContext* styleContext = nsnull;
tableFrame->GetStyleContext(aPresContext,styleContext);
const nsStyleColor* colorData = (const nsStyleColor*)styleContext->GetStyleData(eStyleStruct_Color);
// Look until we find a style context with a NON-transparent background color
while (styleContext)
{
if ((colorData->mBackgroundFlags & NS_STYLE_BG_COLOR_TRANSPARENT)!=0)
{
nsIStyleContext* temp = styleContext;
styleContext = styleContext->GetParent();
NS_RELEASE(temp);
colorData = (const nsStyleColor*)styleContext->GetStyleData(eStyleStruct_Color);
}
else
{
break;
}
}
// Yaahoo, we found a style context which has a background color
nscolor borderColor = 0xFFC0C0C0;
if (styleContext != nsnull)
borderColor = colorData->mBackgroundColor;
// if the border color is white, then shift to grey
if (borderColor == 0xFFFFFFFF)
borderColor = 0xFFC0C0C0;
aSpacingStyle.mBorderColor[NS_SIDE_TOP] =
aSpacingStyle.mBorderColor[NS_SIDE_LEFT] =
aSpacingStyle.mBorderColor[NS_SIDE_BOTTOM] =
aSpacingStyle.mBorderColor[NS_SIDE_RIGHT] = borderColor;
}
PRBool nsTableCellFrame::ConvertToPixelValue(nsHTMLValue& aValue, PRInt32 aDefault, PRInt32& aResult)
{
PRInt32 result = 0;
if (aValue.GetUnit() == eHTMLUnit_Pixel)
aResult = aValue.GetPixelValue();
else if (aValue.GetUnit() == eHTMLUnit_Empty)
aResult = aDefault;
else
{
NS_ERROR("Unit must be pixel or empty");
return PR_FALSE;
}
return PR_TRUE;
}
void nsTableCellFrame::MapBorderMarginPadding(nsIPresContext* aPresContext)
{
// Check to see if the table has either cell padding or
// Cell spacing defined for the table. If true, then
// this setting overrides any specific border, margin or
// padding information in the cell. If these attributes
// are not defined, the the cells attributes are used
nscoord padding = 0;
nscoord spacing = 0;
nscoord border = 1;
float p2t = aPresContext->GetPixelsToTwips();
nsTableFrame* tableFrame = GetTableFrame();
tableFrame->GetGeometricParent((nsIFrame *&)tableFrame); // get the outer frame
NS_ASSERTION(tableFrame,"Table Must not be null");
if (!tableFrame)
return;
// get the table frame style context, and from it get cellpadding, cellspacing, and border info
nsStyleTable* tableStyle;
tableFrame->GetStyleData(eStyleStruct_Table, (nsStyleStruct *&)tableStyle);
nsStyleSpacing* tableSpacingStyle;
tableFrame->GetStyleData(eStyleStruct_Spacing,(nsStyleStruct *&)tableSpacingStyle);
nsStyleSpacing* spacingData = (nsStyleSpacing*)mStyleContext->GetMutableStyleData(eStyleStruct_Spacing);
// check to see if cellpadding or cellspacing is defined
if (tableStyle->mCellPadding.GetUnit() != eStyleUnit_Null ||
tableStyle->mCellSpacing.GetUnit() != eStyleUnit_Null)
{
spacingData->mMargin.SetTop(tableStyle->mCellSpacing);
spacingData->mMargin.SetLeft(tableStyle->mCellSpacing);
spacingData->mMargin.SetBottom(tableStyle->mCellSpacing);
spacingData->mMargin.SetRight(tableStyle->mCellSpacing);
spacingData->mPadding.SetTop(tableStyle->mCellPadding);
spacingData->mPadding.SetLeft(tableStyle->mCellPadding);
spacingData->mPadding.SetBottom(tableStyle->mCellPadding);
spacingData->mPadding.SetRight(tableStyle->mCellPadding);
}
// get border information from the table
if (tableSpacingStyle->mBorder.GetTopUnit() == eStyleUnit_Coord)
{
nsStyleCoord borderWidth;
tableSpacingStyle->mBorder.GetTop(borderWidth);
if (0!=borderWidth.GetCoordValue())
{
// in HTML, cell borders are always 1 pixel by default
border = (nscoord)(1*(aPresContext->GetPixelsToTwips()));
MapHTMLBorderStyle(aPresContext, *spacingData, border);
}
}
}
void nsTableCellFrame::MapTextAttributes(nsIPresContext* aPresContext)
{
nsHTMLValue value;
((nsHTMLTagContent*)mContent)->GetAttribute(nsHTMLAtoms::align, value);
if (value.GetUnit() == eHTMLUnit_Enumerated)
{
nsStyleText* text = (nsStyleText*)mStyleContext->GetMutableStyleData(eStyleStruct_Text);
text->mTextAlign = value.GetIntValue();
}
}
// Subclass hook for style post processing
NS_METHOD nsTableCellFrame::DidSetStyleContext(nsIPresContext* aPresContext)
{
#ifdef NOISY_STYLE
printf("nsTableCellFrame::DidSetStyleContext \n");
#endif
MapTextAttributes(aPresContext);
MapBorderMarginPadding(aPresContext);
mStyleContext->RecalcAutomaticData(aPresContext);
return NS_OK;
}
NS_METHOD
nsTableCellFrame::QueryInterface(const nsIID& aIID, void** aInstancePtr)
{
NS_PRECONDITION(0 != aInstancePtr, "null ptr");
if (NULL == aInstancePtr) {
return NS_ERROR_NULL_POINTER;
}
if (aIID.Equals(kTableCellFrameCID)) {
*aInstancePtr = (void*) (this);
return NS_OK;
}
return nsContainerFrame::QueryInterface(aIID, aInstancePtr);
}
/* ----- static methods ----- */
nsresult nsTableCellFrame::NewFrame(nsIFrame** aInstancePtrResult,
nsIContent* aContent,
nsIFrame* aParent)
{
NS_PRECONDITION(nsnull != aInstancePtrResult, "null ptr");
if (nsnull == aInstancePtrResult) {
return NS_ERROR_NULL_POINTER;
}
nsIFrame* it = new nsTableCellFrame(aContent, aParent);
if (nsnull == it) {
return NS_ERROR_OUT_OF_MEMORY;
}
*aInstancePtrResult = it;
return NS_OK;
}
/* ----- methods from CellLayoutData ----- */
/**
* Given a frame and an edge, find the margin
*
**/
nscoord nsTableCellFrame::GetMargin(nsIFrame* aFrame, PRUint8 aEdge) const
{
nscoord result = 0;
if (aFrame)
{
const nsStyleSpacing* spacing;
aFrame->GetStyleData(eStyleStruct_Spacing, (const nsStyleStruct*&)spacing);
nsMargin margin;
spacing->CalcMarginFor(aFrame, margin);
switch (aEdge)
{
case NS_SIDE_TOP:
result = margin.top;
break;
case NS_SIDE_RIGHT:
result = margin.right;
break;
case NS_SIDE_BOTTOM:
result = margin.bottom;
break;
case NS_SIDE_LEFT:
result = margin.left;
break;
}
}
return result;
}
/**
* Given a style context and an edge, find the border width
*
**/
nscoord nsTableCellFrame::GetBorderWidth(nsIFrame* aFrame, PRUint8 aEdge) const
{
nscoord result = 0;
if (aFrame)
{
const nsStyleSpacing* spacing;
aFrame->GetStyleData(eStyleStruct_Spacing, (const nsStyleStruct*&)spacing);
nsMargin border;
spacing->CalcBorderFor(aFrame, border);
switch (aEdge)
{
case NS_SIDE_TOP:
result = border.top;
break;
case NS_SIDE_RIGHT:
result = border.right;
break;
case NS_SIDE_BOTTOM:
result = border.bottom;
break;
case NS_SIDE_LEFT:
result = border.left;
break;
}
}
return result;
}
/**
* Given a style context and an edge, find the padding
*
**/
nscoord nsTableCellFrame::GetPadding(nsIFrame* aFrame, PRUint8 aEdge) const
{
nscoord result = 0;
if (aFrame)
{
const nsStyleSpacing* spacing;
aFrame->GetStyleData(eStyleStruct_Spacing, (const nsStyleStruct*&)spacing);
nsMargin padding;
spacing->CalcPaddingFor(aFrame, padding);
switch (aEdge)
{
case NS_SIDE_TOP:
result = padding.top;
break;
case NS_SIDE_RIGHT:
result = padding.right;
break;
case NS_SIDE_BOTTOM:
result = padding.bottom;
break;
case NS_SIDE_LEFT:
result = padding.left;
break;
}
}
return result;
}
/**
* Given an Edge, find the opposing edge (top<-->bottom, left<-->right)
*
**/
PRUint8 nsTableCellFrame::GetOpposingEdge(PRUint8 aEdge)
{
PRUint8 result;
switch (aEdge)
{
case NS_SIDE_LEFT:
result = NS_SIDE_RIGHT;
break;
case NS_SIDE_RIGHT:
result = NS_SIDE_LEFT;
break;
case NS_SIDE_TOP:
result = NS_SIDE_BOTTOM;
break;
case NS_SIDE_BOTTOM:
result = NS_SIDE_TOP;
break;
default:
result = NS_SIDE_TOP;
}
return result;
}
/*
*
* Determine border style for two cells.
*
1.If the adjacent elements are of the same type, the wider of the two borders is used.
"Wider" takes into account the border-style of 'none', so a "1px solid" border
will take precedence over a "20px none" border.
2.If there are two or more with the same width, but different style,
then the one with a style near the start of the following list will be drawn:
'blank', 'double', 'solid', 'dashed', 'dotted', 'ridge', 'groove', 'none'
3.If the borders are of the same width, the border on the element occurring first is used.
First is defined as aStyle for this method.
NOTE: This assumes left-to-right, top-to-bottom bias. -- gpk
*
*/
nsIFrame* nsTableCellFrame::CompareCellBorders(nsIFrame* aFrame1,
PRUint8 aEdge1,
nsIFrame* aFrame2,
PRUint8 aEdge2)
{
PRInt32 width1 = GetBorderWidth(aFrame1,aEdge1);
PRInt32 width2 = GetBorderWidth(aFrame2,aEdge2);
nsIFrame* result = nsnull;
if (width1 > width2)
result = aFrame1;
else if (width1 < width2)
result = aFrame2;
else // width1 == width2
{
const nsStyleSpacing* border1;
const nsStyleSpacing* border2;
aFrame1->GetStyleData(eStyleStruct_Spacing, (const nsStyleStruct*&)border1);
aFrame2->GetStyleData(eStyleStruct_Spacing, (const nsStyleStruct*&)border2);
if (border1->mBorderStyle[aEdge1] >= border2->mBorderStyle[aEdge2])
result = aFrame1;
else
result = aFrame2;
}
return result;
}
/**
* Given a List of cell layout data, compare the edges to see which has the
* border with the highest precidence.
*
**/
nsIFrame* nsTableCellFrame::FindHighestPrecedentBorder(nsVoidArray* aList,
PRUint8 aEdge)
{
nsIFrame* result = nsnull;
PRInt32 index = 0;
PRInt32 count = 0;
NS_ASSERTION(aList,"a List must be valid");
count = aList->Count();
if (count)
{
nsIFrame* frame1;
nsIFrame* frame2;
frame1 = (nsIFrame*)(aList->ElementAt(index++));
while (index < count)
{
frame2 = (nsIFrame*)(aList->ElementAt(index++));
if (GetMargin(frame2,aEdge) == 0) {
frame1 = CompareCellBorders(frame1, aEdge, frame2, aEdge);
}
}
if ((nsnull != frame1) && (GetMargin(frame1, aEdge) != 0))
result = frame1;
}
return result;
}
nsIFrame* nsTableCellFrame::FindInnerBorder(nsVoidArray* aList, PRUint8 aEdge)
{
nsIFrame* result = nsnull;
PRUint8 opposite = GetOpposingEdge(aEdge);
if (GetMargin(this, aEdge) == 0)
{
nsIFrame* altFrame = FindHighestPrecedentBorder(aList,opposite);
if (nsnull != altFrame)
result = CompareCellBorders(this, aEdge, altFrame, opposite);
else
result = this;
}
return result;
}
/*
*
* FindRelevantBorder recursively searches up the frame hierarchy for the border
* style that is applicable to the cell. If at any point the frame has a margin
* or the parent frame has padding, then the outer frame for this object takes
* presendence over the inner frame.
1.Borders on 'table' elements take precedence over borders on any other table elements.
2.Borders on 'row-groups' take precedence over borders on 'rows',
and likewise borders on 'column-groups' take precedence over borders on 'columns'.
3.Borders on any other type of table element take precedence over 'table-cell' elements.
*
* NOTE: This method assumes that the table cell potentially shares a border.
* It should not be called for internal cells
*
* NOTE: COLUMNS AND COLGROUPS NEED TO BE FIGURED INTO THE ALGORITHM -- GPK!!!
*
*
*/
nsIFrame* nsTableCellFrame::FindOuterBorder( nsTableFrame* aTableFrame,
PRUint8 aEdge)
{
nsIFrame* frame = this; // By default, return our frame
PRBool done = PR_FALSE;
// The table frame is the outer most frame we test against
while (done == PR_FALSE)
{
done = PR_TRUE; // where done unless the frame's margin is zero
// and the parent's padding is zero
nscoord margin = GetMargin(frame,aEdge);
// if the margin for this style is zero then check to see if the paddding
// for the parent frame is also zero
if (margin == 0)
{
nsIFrame* parentFrame;
frame->GetGeometricParent(parentFrame);
// if the padding for the parent style is zero just
// recursively call this routine
PRInt32 padding = GetPadding(parentFrame,aEdge);
if ((nsnull != parentFrame) && (padding == 0))
{
frame = parentFrame;
// If this frame represents the table frame then
// the table style is used
done = PRBool(frame != (nsIFrame*)aTableFrame);
continue;
}
}
}
return frame;
}
/*
Border Resolution
1.Borders on 'table' elements take precedence over borders on any other table elements.
2.Borders on 'row-groups' take precedence over borders on 'rows', and likewise borders on 'column-groups' take
precedence over borders on 'columns'.
3.Borders on any other type of table element take precedence over 'table-cell' elements.
4.If the adjacent elements are of the same type, the wider of the two borders is used. "Wider" takes into account
the border-style of 'none', so a "1px solid" border will take precedence over a "20px none" border.
5.If the borders are of the same width, the border on the element occurring first is used.
How to compare
1.Those of the one or two cells that have an edge here.
Less than two can occur at the edge of the table, but also
at the edges of "holes" (unoccupied grid cells).
2.Those of the columns that have an edge here.
3.Those of the column groups that have an edge here.
4.Those of the rows that have an edge here.
5.Those of the row groups that have an edge here.
6.Those of the table, if this is the edge of the table.
*
* @param aIsFirst -- TRUE if this is the first cell in the row
* @param aIsLast -- TRUE if this is the last cell in the row
* @param aIsTop -- TRUE if this is the top cell in the column
* @param aIsBottom -- TRUE if this is the last cell in the column
*/
nsIFrame* nsTableCellFrame::FindBorderFrame(nsTableFrame* aTableFrame,
nsVoidArray* aList,
PRUint8 aEdge)
{
nsIFrame* frame = nsnull;
if (aList && aList->Count() == 0)
frame = FindOuterBorder(aTableFrame, aEdge);
else
frame = FindInnerBorder(aList, aEdge);
if (! frame)
frame = this;
return frame;
}
/**
* Given a List of cell layout data, compare the edges to see which has the
* border with the highest precidence.
*
**/
nscoord nsTableCellFrame::FindLargestMargin(nsVoidArray* aList,PRUint8 aEdge)
{
nscoord result = 0;
PRInt32 index = 0;
PRInt32 count = 0;
NS_ASSERTION(aList,"a List must be valid");
count = aList->Count();
if (count)
{
nsIFrame* frame;
nscoord value = 0;
while (index < count)
{
frame = (nsIFrame*)(aList->ElementAt(index++));
value = GetMargin(frame, aEdge);
if (value > result)
result = value;
}
}
return result;
}
void nsTableCellFrame::CalculateMargins(nsTableFrame* aTableFrame,
nsVoidArray* aBoundaryCells[4])
{
// By default the margin is just the margin found in the
// table cells style
const nsStyleSpacing* spacing;
GetStyleData(eStyleStruct_Spacing, (const nsStyleStruct*&)spacing);
spacing->CalcMarginFor(this, mMargin);
// Left and Top Margins are collapsed with their neightbors
// Right and Bottom Margins are simple left as they are
nscoord value;
// The left and top sides margins are the difference between
// their inherint value and the value of the margin of the
// object to the left or right of them.
value = FindLargestMargin(aBoundaryCells[NS_SIDE_LEFT],NS_SIDE_RIGHT);
if (value > mMargin.left)
mMargin.left = 0;
else
mMargin.left -= value;
value = FindLargestMargin(aBoundaryCells[NS_SIDE_TOP],NS_SIDE_BOTTOM);
if (value > mMargin.top)
mMargin.top = 0;
else
mMargin.top -= value;
}
void nsTableCellFrame::RecalcLayoutData(nsTableFrame* aTableFrame,
nsVoidArray* aBoundaryCells[4])
{
CalculateBorders(aTableFrame, aBoundaryCells);
CalculateMargins(aTableFrame, aBoundaryCells);
mCalculated = NS_OK;
}
#if 0 //QQQ
void nsTableCellFrame::List(FILE* out, PRInt32 aIndent) const
{
PRInt32 indent;
nsIContent* cell;
this->GetContent(cell);
if (cell != nsnull)
{
/*
for (indent = aIndent; --indent >= 0; ) fputs(" ", out);
fprintf(out,"RowSpan = %d ColSpan = %d \n",cell->GetRowSpan(),cell->GetColSpan());
*/
for (indent = aIndent; --indent >= 0; ) fputs(" ", out);
fprintf(out,"Margin -- Top: %d Left: %d Bottom: %d Right: %d \n",
NS_TWIPS_TO_POINTS_INT(mMargin.top),
NS_TWIPS_TO_POINTS_INT(mMargin.left),
NS_TWIPS_TO_POINTS_INT(mMargin.bottom),
NS_TWIPS_TO_POINTS_INT(mMargin.right));
for (indent = aIndent; --indent >= 0; ) fputs(" ", out);
nscoord top,left,bottom,right;
top = (mBorderFrame[NS_SIDE_TOP] ? GetBorderWidth((nsIFrame*)mBorderFrame[NS_SIDE_TOP], NS_SIDE_TOP) : 0);
left = (mBorderFrame[NS_SIDE_LEFT] ? GetBorderWidth((nsIFrame*)mBorderFrame[NS_SIDE_LEFT], NS_SIDE_LEFT) : 0);
bottom = (mBorderFrame[NS_SIDE_BOTTOM] ? GetBorderWidth((nsIFrame*)mBorderFrame[NS_SIDE_BOTTOM], NS_SIDE_BOTTOM) : 0);
right = (mBorderFrame[NS_SIDE_RIGHT] ? GetBorderWidth((nsIFrame*)mBorderFrame[NS_SIDE_RIGHT], NS_SIDE_RIGHT) : 0);
fprintf(out,"Border -- Top: %d Left: %d Bottom: %d Right: %d \n",
NS_TWIPS_TO_POINTS_INT(top),
NS_TWIPS_TO_POINTS_INT(left),
NS_TWIPS_TO_POINTS_INT(bottom),
NS_TWIPS_TO_POINTS_INT(right));
cell->List(out,aIndent);
NS_RELEASE(cell);
}
}
#endif
/* ----- debug only methods, to be removed ----- */
// For Debugging ONLY
NS_METHOD nsTableCellFrame::MoveTo(nscoord aX, nscoord aY)
{
if ((aX != mRect.x) || (aY != mRect.y)) {
mRect.x = aX;
mRect.y = aY;
nsIView* view;
GetView(view);
// Let the view know
if (nsnull != view) {
// Position view relative to it's parent, not relative to our
// parent frame (our parent frame may not have a view).
nsIView* parentWithView;
nsPoint origin;
GetOffsetFromView(origin, parentWithView);
view->SetPosition(origin.x, origin.y);
NS_IF_RELEASE(parentWithView);
}
}
return NS_OK;
}
NS_METHOD nsTableCellFrame::SizeTo(nscoord aWidth, nscoord aHeight)
{
mRect.width = aWidth;
mRect.height = aHeight;
nsIView* view;
GetView(view);
// Let the view know
if (nsnull != view) {
view->SetDimensions(aWidth, aHeight);
}
return NS_OK;
}
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