зеркало из https://github.com/mozilla/pjs.git
1071 строка
32 KiB
C++
1071 строка
32 KiB
C++
/* -*- 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 "nsSpaceManager.h"
|
|
#include "nsPoint.h"
|
|
#include "nsRect.h"
|
|
#include "nsSize.h"
|
|
#include <stdlib.h>
|
|
#include "nsVoidArray.h"
|
|
|
|
static NS_DEFINE_IID(kISpaceManagerIID, NS_ISPACEMANAGER_IID);
|
|
|
|
PR_CALLBACK PLHashNumber
|
|
NS_HashNumber(const void* key)
|
|
{
|
|
return (PLHashNumber)key;
|
|
}
|
|
|
|
PR_CALLBACK PRIntn
|
|
NS_RemoveFrameInfoEntries(PLHashEntry* he, PRIntn i, void* arg)
|
|
{
|
|
nsSpaceManager::FrameInfo* frameInfo = (nsSpaceManager::FrameInfo*)he->value;
|
|
|
|
NS_ASSERTION(nsnull != frameInfo, "null frameInfo");
|
|
delete frameInfo;
|
|
return HT_ENUMERATE_REMOVE;
|
|
}
|
|
|
|
/////////////////////////////////////////////////////////////////////////////
|
|
// BandList
|
|
|
|
nsSpaceManager::BandList::BandList()
|
|
: BandRect(-1, -1, -1, -1, (nsIFrame*)nsnull)
|
|
{
|
|
PR_INIT_CLIST(this);
|
|
numFrames = 0;
|
|
}
|
|
|
|
void nsSpaceManager::BandList::Clear()
|
|
{
|
|
if (!IsEmpty()) {
|
|
BandRect* bandRect = Head();
|
|
|
|
while (bandRect != this) {
|
|
BandRect* next = bandRect->Next();
|
|
|
|
delete bandRect;
|
|
bandRect = next;
|
|
}
|
|
|
|
PR_INIT_CLIST(this);
|
|
}
|
|
}
|
|
|
|
|
|
/////////////////////////////////////////////////////////////////////////////
|
|
// nsSpaceManager
|
|
|
|
nsSpaceManager::nsSpaceManager(nsIFrame* aFrame)
|
|
: mFrame(aFrame)
|
|
{
|
|
NS_INIT_REFCNT();
|
|
mX = mY = 0;
|
|
mFrameInfoMap = nsnull;
|
|
}
|
|
|
|
void nsSpaceManager::ClearFrameInfo()
|
|
{
|
|
if (nsnull != mFrameInfoMap) {
|
|
PL_HashTableEnumerateEntries(mFrameInfoMap, NS_RemoveFrameInfoEntries, 0);
|
|
PL_HashTableDestroy(mFrameInfoMap);
|
|
mFrameInfoMap = nsnull;
|
|
}
|
|
}
|
|
|
|
nsSpaceManager::~nsSpaceManager()
|
|
{
|
|
mBandList.Clear();
|
|
ClearFrameInfo();
|
|
}
|
|
|
|
NS_IMPL_ISUPPORTS(nsSpaceManager, kISpaceManagerIID);
|
|
|
|
nsIFrame* nsSpaceManager::GetFrame() const
|
|
{
|
|
return mFrame;
|
|
}
|
|
|
|
void nsSpaceManager::Translate(nscoord aDx, nscoord aDy)
|
|
{
|
|
mX += aDx;
|
|
mY += aDy;
|
|
}
|
|
|
|
void nsSpaceManager::GetTranslation(nscoord& aX, nscoord& aY) const
|
|
{
|
|
aX = mX;
|
|
aY = mY;
|
|
}
|
|
|
|
nscoord nsSpaceManager::YMost() const
|
|
{
|
|
nscoord yMost;
|
|
|
|
if (mBandList.IsEmpty()) {
|
|
yMost = 0;
|
|
} else {
|
|
BandRect* lastRect = mBandList.Tail();
|
|
|
|
yMost = lastRect->bottom;
|
|
}
|
|
|
|
return yMost;
|
|
}
|
|
|
|
/**
|
|
* Internal function that returns the list of available and unavailable space
|
|
* within the band
|
|
*
|
|
* @param aBand the first rect in the band
|
|
* @param aY the y-offset in world coordinates
|
|
* @param aMaxSize the size to use to constrain the band data
|
|
* @param aAvailableBand
|
|
*/
|
|
PRInt32 nsSpaceManager::GetBandAvailableSpace(const BandRect* aBand,
|
|
nscoord aY,
|
|
const nsSize& aMaxSize,
|
|
nsBandData& aBandData) const
|
|
{
|
|
nscoord topOfBand = aBand->top;
|
|
nscoord localY = aY - mY;
|
|
nscoord height = PR_MIN(aBand->bottom - aY, aMaxSize.height);
|
|
nsBandTrapezoid* trapezoid = aBandData.trapezoids;
|
|
nscoord rightEdge = mX + aMaxSize.width;
|
|
|
|
// Initialize the band data
|
|
aBandData.count = 0;
|
|
|
|
// Skip any rectangles that are to the left of the local coordinate space
|
|
while (aBand->top == topOfBand) {
|
|
if (aBand->right > mX) {
|
|
break;
|
|
}
|
|
|
|
// Get the next rect in the band
|
|
aBand = aBand->Next();
|
|
}
|
|
|
|
// This is used to track the current x-location within the band. This is in
|
|
// world coordinates
|
|
nscoord left = mX;
|
|
|
|
// Process the remaining rectangles that are within the clip width
|
|
while ((aBand->top == topOfBand) && (aBand->left < rightEdge)) {
|
|
// Compare the left edge of the occupied space with the current left
|
|
// coordinate
|
|
if (aBand->left > left) {
|
|
// The rect is to the right of our current left coordinate, so we've
|
|
// found some available space
|
|
trapezoid->state = nsBandTrapezoid::Available;
|
|
trapezoid->frame = nsnull;
|
|
|
|
// Assign the trapezoid a rectangular shape. The trapezoid must be in the
|
|
// local coordinate space, so convert the current left coordinate
|
|
*trapezoid = nsRect(left - mX, localY, aBand->left - left, height);
|
|
|
|
// Move to the next output rect
|
|
trapezoid++;
|
|
aBandData.count++;
|
|
}
|
|
|
|
// The rect represents unavailable space, so add another trapezoid
|
|
if (1 == aBand->numFrames) {
|
|
trapezoid->state = nsBandTrapezoid::Occupied;
|
|
trapezoid->frame = aBand->frame;
|
|
} else {
|
|
NS_ASSERTION(aBand->numFrames > 1, "unexpected frame count");
|
|
trapezoid->state = nsBandTrapezoid::OccupiedMultiple;
|
|
trapezoid->frames = aBand->frames;
|
|
}
|
|
|
|
nscoord x = aBand->left;
|
|
// The first band can straddle the clip rect
|
|
if (x < mX) {
|
|
// Clip the left edge
|
|
x = mX;
|
|
}
|
|
|
|
// Assign the trapezoid a rectangular shape. The trapezoid must be in the
|
|
// local coordinate space, so convert the rects's left coordinate
|
|
*trapezoid = nsRect(x - mX, localY, aBand->right - x, height);
|
|
|
|
// Move to the next output rect
|
|
trapezoid++;
|
|
aBandData.count++;
|
|
|
|
// Adjust our current x-location within the band
|
|
left = aBand->right;
|
|
|
|
// Move to the next rect within the band
|
|
aBand = aBand->Next();
|
|
}
|
|
|
|
// No more rects left in the band. If we haven't yet reached the right edge,
|
|
// then all the remaining space is available
|
|
if (left < rightEdge) {
|
|
trapezoid->state = nsBandTrapezoid::Available;
|
|
trapezoid->frame = nsnull;
|
|
|
|
// Assign the trapezoid a rectangular shape. The trapezoid must be in the
|
|
// local coordinate space, so convert the current left coordinate
|
|
*trapezoid = nsRect(left - mX, localY, rightEdge - left, height);
|
|
aBandData.count++;
|
|
}
|
|
|
|
return aBandData.count;
|
|
}
|
|
|
|
PRInt32 nsSpaceManager::GetBandData(nscoord aYOffset,
|
|
const nsSize& aMaxSize,
|
|
nsBandData& aBandData) const
|
|
{
|
|
// Convert the y-offset to world coordinates
|
|
nscoord y = mY + aYOffset;
|
|
|
|
// If there are no unavailable rects or the offset is below the bottommost
|
|
// band, then all the space is available
|
|
if (y >= YMost()) {
|
|
// All the requested space is available
|
|
aBandData.count = 1;
|
|
aBandData.trapezoids[0] = nsRect(0, aYOffset, aMaxSize.width, aMaxSize.height);
|
|
aBandData.trapezoids[0].state = nsBandTrapezoid::Available;
|
|
aBandData.trapezoids[0].frame = nsnull;
|
|
} else {
|
|
// Find the first band that contains the y-offset or is below the y-offset
|
|
NS_ASSERTION(!mBandList.IsEmpty(), "no bands");
|
|
BandRect* band = mBandList.Head();
|
|
|
|
aBandData.count = 0;
|
|
while (nsnull != band) {
|
|
if (band->top > y) {
|
|
// The band is below the y-offset. The area between the y-offset and
|
|
// the top of the band is available
|
|
aBandData.count = 1;
|
|
aBandData.trapezoids[0] =
|
|
nsRect(0, aYOffset, aMaxSize.width, PR_MIN(band->top - y, aMaxSize.height));
|
|
aBandData.trapezoids[0].state = nsBandTrapezoid::Available;
|
|
aBandData.trapezoids[0].frame = nsnull;
|
|
break;
|
|
} else if (y < band->bottom) {
|
|
// The band contains the y-offset. Return a list of available and
|
|
// unavailable rects within the band
|
|
return GetBandAvailableSpace(band, y, aMaxSize, aBandData);
|
|
} else {
|
|
// Skip to the next band
|
|
band = GetNextBand(band);
|
|
}
|
|
}
|
|
}
|
|
|
|
NS_POSTCONDITION(aBandData.count > 0, "unexpected band data count");
|
|
return aBandData.count;
|
|
}
|
|
|
|
/**
|
|
* Skips to the start of the next band.
|
|
*
|
|
* @param aBandRect A rect within the band
|
|
* @returns The start of the next band, or nsnull of this is the last band.
|
|
*/
|
|
nsSpaceManager::BandRect* nsSpaceManager::GetNextBand(const BandRect* aBandRect) const
|
|
{
|
|
nscoord topOfBand = aBandRect->top;
|
|
|
|
aBandRect = aBandRect->Next();
|
|
while (aBandRect != &mBandList) {
|
|
// Check whether this rect is part of the same band
|
|
if (aBandRect->top != topOfBand) {
|
|
// We found the start of the next band
|
|
return (BandRect*)aBandRect;
|
|
}
|
|
|
|
aBandRect = aBandRect->Next();
|
|
}
|
|
|
|
// No bands left
|
|
return nsnull;
|
|
}
|
|
|
|
/**
|
|
* Divides the current band into two vertically
|
|
*
|
|
* @param aBandRect the first rect in the band
|
|
* @param aBottom where to split the band. This becomes the bottom of the top
|
|
* part
|
|
*/
|
|
void nsSpaceManager::DivideBand(BandRect* aBandRect, nscoord aBottom)
|
|
{
|
|
NS_PRECONDITION(aBottom < aBandRect->bottom, "bad height");
|
|
nscoord topOfBand = aBandRect->top;
|
|
BandRect* nextBand = GetNextBand(aBandRect);
|
|
|
|
if (nsnull == nextBand) {
|
|
nextBand = (BandRect*)&mBandList;
|
|
}
|
|
|
|
while (topOfBand == aBandRect->top) {
|
|
// Split the band rect into two vertically
|
|
BandRect* bottomBandRect = aBandRect->SplitVertically(aBottom);
|
|
|
|
// Insert the new bottom part
|
|
nextBand->InsertBefore(bottomBandRect);
|
|
|
|
// Move to the next rect in the band
|
|
aBandRect = aBandRect->Next();
|
|
}
|
|
}
|
|
|
|
PRBool nsSpaceManager::CanJoinBands(BandRect* aBand, BandRect* aPrevBand)
|
|
{
|
|
PRBool result;
|
|
nscoord topOfBand = aBand->top;
|
|
nscoord topOfPrevBand = aPrevBand->top;
|
|
|
|
// The bands can be joined if:
|
|
// - they're adjacent
|
|
// - they have the same number of rects
|
|
// - each rect has the same left and right edge as its corresponding rect, and
|
|
// the rects are occupied by the same frames
|
|
if (aPrevBand->bottom == aBand->top) {
|
|
// Compare each of the rects in the two bands
|
|
while (PR_TRUE) {
|
|
if ((aBand->left != aPrevBand->left) || (aBand->right != aPrevBand->right)) {
|
|
// The rects have different edges
|
|
result = PR_FALSE;
|
|
break;
|
|
}
|
|
|
|
if (!aBand->HasSameFrameList(aPrevBand)) {
|
|
// The rects are occupied by different frames
|
|
result = PR_FALSE;
|
|
break;
|
|
}
|
|
|
|
// Move to the next rects within the bands
|
|
aBand = aBand->Next();
|
|
aPrevBand = aPrevBand->Next();
|
|
|
|
// Have we reached the end of either band?
|
|
PRBool endOfBand = aBand->top != topOfBand;
|
|
PRBool endOfPrevBand = aPrevBand->top != topOfPrevBand;
|
|
|
|
if (endOfBand || endOfPrevBand) {
|
|
result = endOfBand & endOfPrevBand;
|
|
break; // all done
|
|
}
|
|
}
|
|
|
|
} else {
|
|
// The bands aren't adjacent
|
|
result = PR_FALSE;
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* Tries to join the two adjacent bands. Returns PR_TRUE if successful and
|
|
* PR_FALSE otherwise
|
|
*
|
|
* If the two bands are joined, the previous band is the the band that's deleted
|
|
*/
|
|
PRBool nsSpaceManager::JoinBands(BandRect* aBand, BandRect* aPrevBand)
|
|
{
|
|
if (CanJoinBands(aBand, aPrevBand)) {
|
|
BandRect* startOfNextBand = aBand;
|
|
|
|
while (aPrevBand != startOfNextBand) {
|
|
// Adjust the top of the band we're keeping, and then move to the next
|
|
// rect within the band
|
|
aBand->top = aPrevBand->top;
|
|
aBand = aBand->Next();
|
|
|
|
// Delete the rect from the previous band
|
|
BandRect* next = aPrevBand->Next();
|
|
|
|
aPrevBand->Remove();
|
|
delete aPrevBand;
|
|
aPrevBand = next;
|
|
}
|
|
|
|
return PR_TRUE;
|
|
}
|
|
|
|
return PR_FALSE;
|
|
}
|
|
|
|
/**
|
|
* Adds a new rect to a band.
|
|
*
|
|
* @param aBand the first rect in the band
|
|
* @param aBandRect the band rect to add to the band
|
|
*/
|
|
void nsSpaceManager::AddRectToBand(BandRect* aBand,
|
|
BandRect* aBandRect)
|
|
{
|
|
NS_PRECONDITION((aBand->top == aBandRect->top) &&
|
|
(aBand->bottom == aBandRect->bottom), "bad band");
|
|
NS_PRECONDITION(1 == aBandRect->numFrames, "shared band rect");
|
|
nscoord topOfBand = aBand->top;
|
|
|
|
// Figure out where in the band horizontally to insert the rect
|
|
do {
|
|
// Compare the left edge of the new rect with the left edge of the existing
|
|
// rect
|
|
if (aBandRect->left < aBand->left) {
|
|
// The new rect's left edge is to the left of the existing rect's left edge.
|
|
// Could be any of these cases (N is new rect, E is existing rect):
|
|
//
|
|
// Case 1: left-of Case 2: overlaps Case 3: N.contains(E)
|
|
// --------------- ---------------- ---------------------
|
|
// +-----+ +-----+ +-----+ +---------+
|
|
// | N | | E | | N | | N |
|
|
// +-----+ +-----+ +-----+ +---------+
|
|
// +-----+ +---+
|
|
// | E | | E |
|
|
// +-----+ +---+
|
|
//
|
|
// Do the two rectangles overlap?
|
|
if (aBandRect->right <= aBand->left) {
|
|
// No, the new rect is completely to the left of the existing rect
|
|
// (case #1). Insert a new rect
|
|
aBand->InsertBefore(aBandRect);
|
|
return;
|
|
}
|
|
|
|
// Yes, they overlap. Compare the right edges.
|
|
if (aBandRect->right > aBand->right) {
|
|
// The new rect's right edge is to the right of the existing rect's
|
|
// right edge (case #3). Split the new rect
|
|
BandRect* r1 = aBandRect->SplitHorizontally(aBand->left);
|
|
|
|
// Insert the part of the new rect that's to the left of the existing
|
|
// rect as a new band rect
|
|
aBand->InsertBefore(aBandRect);
|
|
|
|
// Continue below with the part that overlaps the existing rect
|
|
aBandRect = r1;
|
|
|
|
} else {
|
|
if (aBand->right > aBandRect->right) {
|
|
// The existing rect extends past the new rect (case #2). Split the
|
|
// existing rect
|
|
BandRect* r1 = aBand->SplitHorizontally(aBandRect->right);
|
|
|
|
// Insert the new right half of the existing rect
|
|
aBand->InsertAfter(r1);
|
|
}
|
|
|
|
// Insert the part of the new rect that's to the left of the existing
|
|
// rect
|
|
aBandRect->right = aBand->left;
|
|
aBand->InsertBefore(aBandRect);
|
|
|
|
// Mark the existing rect as shared
|
|
aBand->AddFrame(aBandRect->frame);
|
|
return;
|
|
}
|
|
}
|
|
|
|
if (aBandRect->left > aBand->left) {
|
|
// The new rect's left edge is to the right of the existing rect's left
|
|
// edge. Could be any one of these cases:
|
|
//
|
|
// Case 4: right-of Case 5: overlaps Case 6: E.Contains(N)
|
|
// --------------- ---------------- ---------------------
|
|
// +-----+ +-----+ +-----+ +------------+
|
|
// | E | | N | | E | | E |
|
|
// +-----+ +-----+ +-----+ +------------+
|
|
// +-----+ +-----+
|
|
// | N | | N |
|
|
// +-----+ +-----+
|
|
//
|
|
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
|
|
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;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
PRBool 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 PR_FALSE;
|
|
}
|
|
|
|
// 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 PR_FALSE;
|
|
}
|
|
|
|
// Create a frame info structure
|
|
frameInfo = CreateFrameInfo(aFrame, rect);
|
|
|
|
// Is the rect empty?
|
|
if (aUnavailableSpace.IsEmpty()) {
|
|
// The rect doesn't consume any space, so don't add any band data
|
|
return PR_TRUE;
|
|
}
|
|
|
|
// Allocate a band rect
|
|
BandRect* bandRect = new BandRect(rect.x, rect.y, rect.XMost(), rect.YMost(), aFrame);
|
|
|
|
// Insert the band rect
|
|
InsertBandRect(bandRect);
|
|
return PR_TRUE;
|
|
}
|
|
|
|
PRBool 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 PR_FALSE;
|
|
}
|
|
|
|
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 PR_FALSE;
|
|
}
|
|
|
|
// For the time being just remove it and add it back in
|
|
RemoveRegion(aFrame);
|
|
return AddRectRegion(aFrame, rect);
|
|
}
|
|
|
|
PRBool 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 PR_FALSE;
|
|
}
|
|
|
|
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 PR_FALSE;
|
|
}
|
|
|
|
// For the time being just remove it and add it back in
|
|
RemoveRegion(aFrame);
|
|
return AddRectRegion(aFrame, rect);
|
|
}
|
|
|
|
PRBool 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 PR_FALSE;
|
|
}
|
|
|
|
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 PR_TRUE;
|
|
}
|
|
|
|
void nsSpaceManager::ClearRegions()
|
|
{
|
|
ClearFrameInfo();
|
|
mBandList.Clear();
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
FrameInfo* frameInfo = new FrameInfo(aFrame, aRect);
|
|
|
|
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;
|
|
}
|