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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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 "nsGridRowLayout.h"
#include "nsBoxLayoutState.h"
#include "nsIScrollableFrame.h"
#include "nsBox.h"
#include "nsStackLayout.h"
#include "nsGrid.h"
nsGridRowLayout::nsGridRowLayout():nsSprocketLayout()
{
}
nsGridRowLayout::~nsGridRowLayout()
{
}
void
nsGridRowLayout::ChildrenInserted(nsIFrame* aBox, nsBoxLayoutState& aState,
nsIFrame* aPrevBox,
const nsFrameList::Slice& aNewChildren)
{
ChildAddedOrRemoved(aBox, aState);
}
void
nsGridRowLayout::ChildrenAppended(nsIFrame* aBox, nsBoxLayoutState& aState,
const nsFrameList::Slice& aNewChildren)
{
ChildAddedOrRemoved(aBox, aState);
}
void
nsGridRowLayout::ChildrenRemoved(nsIFrame* aBox, nsBoxLayoutState& aState, nsIFrame* aChildList)
{
ChildAddedOrRemoved(aBox, aState);
}
void
nsGridRowLayout::ChildrenSet(nsIFrame* aBox, nsBoxLayoutState& aState, nsIFrame* aChildList)
{
ChildAddedOrRemoved(aBox, aState);
}
nsIGridPart*
nsGridRowLayout::GetParentGridPart(nsIFrame* aBox, nsIFrame** aParentBox)
{
// go up and find our parent gridRow. Skip and non gridRow
// parents.
*aParentBox = nullptr;
// walk up through any scrollboxes
aBox = nsGrid::GetScrollBox(aBox);
// get the parent
if (aBox)
aBox = nsBox::GetParentXULBox(aBox);
if (aBox)
{
nsIGridPart* parentGridRow = nsGrid::GetPartFromBox(aBox);
if (parentGridRow && parentGridRow->CanContain(this)) {
*aParentBox = aBox;
return parentGridRow;
}
}
return nullptr;
}
nsGrid*
nsGridRowLayout::GetGrid(nsIFrame* aBox, int32_t* aIndex, nsGridRowLayout* aRequestor)
{
if (aRequestor == nullptr)
{
nsIFrame* parentBox; // nsIFrame is implemented by nsIFrame and is not refcounted.
nsIGridPart* parent = GetParentGridPart(aBox, &parentBox);
if (parent)
return parent->GetGrid(parentBox, aIndex, this);
return nullptr;
}
int32_t index = -1;
nsIFrame* child = nsBox::GetChildXULBox(aBox);
int32_t count = 0;
while(child)
{
// if there is a scrollframe walk inside it to its child
nsIFrame* childBox = nsGrid::GetScrolledBox(child);
nsBoxLayout* layout = childBox->GetXULLayoutManager();
nsIGridPart* gridRow = nsGrid::GetPartFromBox(childBox);
if (gridRow)
{
if (layout == aRequestor) {
index = count;
break;
}
count += gridRow->GetRowCount();
} else
count++;
child = nsBox::GetNextXULBox(child);
}
// if we didn't find ourselves then the tree isn't properly formed yet
// this could happen during initial construction so lets just
// fail.
if (index == -1) {
*aIndex = -1;
return nullptr;
}
(*aIndex) += index;
nsIFrame* parentBox; // nsIFrame is implemented by nsIFrame and is not refcounted.
nsIGridPart* parent = GetParentGridPart(aBox, &parentBox);
if (parent)
return parent->GetGrid(parentBox, aIndex, this);
return nullptr;
}
nsMargin
nsGridRowLayout::GetTotalMargin(nsIFrame* aBox, bool aIsHorizontal)
{
// get our parents margin
nsMargin margin(0,0,0,0);
nsIFrame* parent = nullptr;
nsIGridPart* part = GetParentGridPart(aBox, &parent);
if (part && parent) {
// if we are the first or last child walk upward and add margins.
// make sure we check for a scrollbox
aBox = nsGrid::GetScrollBox(aBox);
// see if we have a next to see if we are last
nsIFrame* next = nsBox::GetNextXULBox(aBox);
// get the parent first child to see if we are first
nsIFrame* child = nsBox::GetChildXULBox(parent);
margin = part->GetTotalMargin(parent, aIsHorizontal);
// if first or last
if (child == aBox || next == nullptr) {
// if it's not the first child remove the top margin
// we don't need it.
if (child != aBox)
{
if (aIsHorizontal)
margin.top = 0;
else
margin.left = 0;
}
// if it's not the last child remove the bottom margin
// we don't need it.
if (next != nullptr)
{
if (aIsHorizontal)
margin.bottom = 0;
else
margin.right = 0;
}
}
}
// add ours to it.
nsMargin ourMargin;
aBox->GetXULMargin(ourMargin);
margin += ourMargin;
return margin;
}
NS_IMPL_ADDREF_INHERITED(nsGridRowLayout, nsBoxLayout)
NS_IMPL_RELEASE_INHERITED(nsGridRowLayout, nsBoxLayout)
NS_INTERFACE_MAP_BEGIN(nsGridRowLayout)
NS_INTERFACE_MAP_ENTRY(nsIGridPart)
NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIGridPart)
NS_INTERFACE_MAP_END_INHERITING(nsBoxLayout)
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