Source code

Revision control

Copy as Markdown

Other Tools

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
//
// Eric Vaughan
// Netscape Communications
//
// See documentation in associated header file
//
#include "nsStackLayout.h"
#include "nsCOMPtr.h"
#include "nsBoxLayoutState.h"
#include "nsBoxFrame.h"
#include "nsGkAtoms.h"
#include "nsIContent.h"
#include "nsNameSpaceManager.h"
using namespace mozilla;
nsBoxLayout* nsStackLayout::gInstance = nullptr;
nsresult NS_NewStackLayout(nsCOMPtr<nsBoxLayout>& aNewLayout) {
if (!nsStackLayout::gInstance) {
nsStackLayout::gInstance = new nsStackLayout();
NS_IF_ADDREF(nsStackLayout::gInstance);
}
// we have not instance variables so just return our static one.
aNewLayout = nsStackLayout::gInstance;
return NS_OK;
}
/*static*/
void nsStackLayout::Shutdown() { NS_IF_RELEASE(gInstance); }
nsStackLayout::nsStackLayout() = default;
/*
* Sizing: we are as wide as the widest child
* we are tall as the tallest child.
*/
nsSize nsStackLayout::GetXULPrefSize(nsIFrame* aBox, nsBoxLayoutState& aState) {
nsSize prefSize(0, 0);
nsIFrame* child = nsIFrame::GetChildXULBox(aBox);
while (child) {
nsSize pref = child->GetXULPrefSize(aState);
AddXULMargin(child, pref);
if (pref.width > prefSize.width) {
prefSize.width = pref.width;
}
if (pref.height > prefSize.height) {
prefSize.height = pref.height;
}
child = nsIFrame::GetNextXULBox(child);
}
AddXULBorderAndPadding(aBox, prefSize);
return prefSize;
}
nsSize nsStackLayout::GetXULMinSize(nsIFrame* aBox, nsBoxLayoutState& aState) {
nsSize minSize(0, 0);
nsIFrame* child = nsIFrame::GetChildXULBox(aBox);
while (child) {
nsSize min = child->GetXULMinSize(aState);
AddXULMargin(child, min);
if (min.width > minSize.width) {
minSize.width = min.width;
}
if (min.height > minSize.height) {
minSize.height = min.height;
}
child = nsIFrame::GetNextXULBox(child);
}
AddXULBorderAndPadding(aBox, minSize);
return minSize;
}
nsSize nsStackLayout::GetXULMaxSize(nsIFrame* aBox, nsBoxLayoutState& aState) {
nsSize maxSize(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
nsIFrame* child = nsIFrame::GetChildXULBox(aBox);
while (child) {
nsSize min = child->GetXULMinSize(aState);
nsSize max = child->GetXULMaxSize(aState);
max = nsIFrame::XULBoundsCheckMinMax(min, max);
AddXULMargin(child, max);
if (max.width < maxSize.width) {
maxSize.width = max.width;
}
if (max.height < maxSize.height) {
maxSize.height = max.height;
}
child = nsIFrame::GetNextXULBox(child);
}
AddXULBorderAndPadding(aBox, maxSize);
return maxSize;
}
nscoord nsStackLayout::GetAscent(nsIFrame* aBox, nsBoxLayoutState& aState) {
nscoord vAscent = 0;
nsIFrame* child = nsIFrame::GetChildXULBox(aBox);
while (child) {
nscoord ascent = child->GetXULBoxAscent(aState);
nsMargin margin;
child->GetXULMargin(margin);
ascent += margin.top;
if (ascent > vAscent) vAscent = ascent;
child = nsIFrame::GetNextXULBox(child);
}
return vAscent;
}
NS_IMETHODIMP
nsStackLayout::XULLayout(nsIFrame* aBox, nsBoxLayoutState& aState) {
nsRect clientRect;
aBox->GetXULClientRect(clientRect);
bool grow;
do {
nsIFrame* child = nsIFrame::GetChildXULBox(aBox);
grow = false;
while (child) {
nsMargin margin;
child->GetXULMargin(margin);
nsRect childRect(clientRect);
childRect.Deflate(margin);
if (childRect.width < 0) childRect.width = 0;
if (childRect.height < 0) childRect.height = 0;
nsRect oldRect(child->GetRect());
bool sizeChanged = !oldRect.IsEqualEdges(childRect);
// only lay out dirty children or children whose sizes have changed
if (sizeChanged || child->IsSubtreeDirty()) {
// add in the child's margin
nsMargin margin;
child->GetXULMargin(margin);
// Now place the child.
child->SetXULBounds(aState, childRect);
// Flow the child.
child->XULLayout(aState);
// Get the child's new rect.
childRect = child->GetRect();
childRect.Inflate(margin);
// Did the child push back on us and get bigger?
if (childRect.width > clientRect.width) {
clientRect.width = childRect.width;
grow = true;
}
if (childRect.height > clientRect.height) {
clientRect.height = childRect.height;
grow = true;
}
}
child = nsIFrame::GetNextXULBox(child);
}
} while (grow);
// if some HTML inside us got bigger we need to force ourselves to
// get bigger
nsRect bounds(aBox->GetRect());
nsMargin bp;
aBox->GetXULBorderAndPadding(bp);
clientRect.Inflate(bp);
if (clientRect.width > bounds.width || clientRect.height > bounds.height) {
if (clientRect.width > bounds.width) bounds.width = clientRect.width;
if (clientRect.height > bounds.height) bounds.height = clientRect.height;
aBox->SetXULBounds(aState, bounds);
}
return NS_OK;
}