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nsListControlFrame.cpp
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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/. */
#include "nscore.h"
#include "nsCOMPtr.h"
#include "nsUnicharUtils.h"
#include "nsListControlFrame.h"
#include "nsFormControlFrame.h" // for COMPARE macro
#include "nsGkAtoms.h"
#include "nsIDOMHTMLSelectElement.h"
#include "nsIDOMHTMLOptionElement.h"
#include "nsComboboxControlFrame.h"
#include "nsIDOMHTMLOptGroupElement.h"
#include "nsIPresShell.h"
#include "nsIDOMMouseEvent.h"
#include "nsIXULRuntime.h"
#include "nsFontMetrics.h"
#include "nsIScrollableFrame.h"
#include "nsCSSRendering.h"
#include "nsIDOMEventListener.h"
#include "nsLayoutUtils.h"
#include "nsDisplayList.h"
#include "nsContentUtils.h"
#include "mozilla/Attributes.h"
#include "mozilla/dom/HTMLOptionsCollection.h"
#include "mozilla/dom/HTMLSelectElement.h"
#include "mozilla/EventStateManager.h"
#include "mozilla/EventStates.h"
#include "mozilla/LookAndFeel.h"
#include "mozilla/MouseEvents.h"
#include "mozilla/Preferences.h"
#include "mozilla/TextEvents.h"
#include <algorithm>
using namespace mozilla;
// Constants
const uint32_t kMaxDropDownRows = 20; // This matches the setting for 4.x browsers
const int32_t kNothingSelected = -1;
// Static members
nsListControlFrame * nsListControlFrame::mFocused = nullptr;
nsString * nsListControlFrame::sIncrementalString = nullptr;
// Using for incremental typing navigation
#define INCREMENTAL_SEARCH_KEYPRESS_TIME 1000
// XXX, [email protected], there are 4 definitions for the same purpose:
// nsMenuPopupFrame.h, nsListControlFrame.cpp, listbox.xml, tree.xml
// need to find a good place to put them together.
// if someone changes one, please also change the other.
DOMTimeStamp nsListControlFrame::gLastKeyTime = 0;
/******************************************************************************
* nsListEventListener
* This class is responsible for propagating events to the nsListControlFrame.
* Frames are not refcounted so they can't be used as event listeners.
*****************************************************************************/
class nsListEventListener final : public nsIDOMEventListener
{
public:
explicit nsListEventListener(nsListControlFrame *aFrame)
: mFrame(aFrame) { }
void SetFrame(nsListControlFrame *aFrame) { mFrame = aFrame; }
NS_DECL_ISUPPORTS
NS_DECL_NSIDOMEVENTLISTENER
private:
~nsListEventListener() {}
nsListControlFrame *mFrame;
};
//---------------------------------------------------------
nsContainerFrame*
NS_NewListControlFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
{
nsListControlFrame* it =
new (aPresShell) nsListControlFrame(aContext);
it->AddStateBits(NS_FRAME_INDEPENDENT_SELECTION);
return it;
}
NS_IMPL_FRAMEARENA_HELPERS(nsListControlFrame)
//---------------------------------------------------------
nsListControlFrame::nsListControlFrame(nsStyleContext* aContext)
: nsHTMLScrollFrame(aContext, false),
mMightNeedSecondPass(false),
mHasPendingInterruptAtStartOfReflow(false),
mDropdownCanGrow(false),
mForceSelection(false),
mLastDropdownComputedBSize(NS_UNCONSTRAINEDSIZE)
{
mComboboxFrame = nullptr;
mChangesSinceDragStart = false;
mButtonDown = false;
mIsAllContentHere = false;
mIsAllFramesHere = false;
mHasBeenInitialized = false;
mNeedToReset = true;
mPostChildrenLoadedReset = false;
mControlSelectMode = false;
}
//---------------------------------------------------------
nsListControlFrame::~nsListControlFrame()
{
mComboboxFrame = nullptr;
}
// for Bug 47302 (remove this comment later)
void
nsListControlFrame::DestroyFrom(nsIFrame* aDestructRoot)
{
// get the receiver interface from the browser button's content node
ENSURE_TRUE(mContent);
// Clear the frame pointer on our event listener, just in case the
// event listener can outlive the frame.
mEventListener->SetFrame(nullptr);
mContent->RemoveSystemEventListener(NS_LITERAL_STRING("keydown"),
mEventListener, false);
mContent->RemoveSystemEventListener(NS_LITERAL_STRING("keypress"),
mEventListener, false);
mContent->RemoveSystemEventListener(NS_LITERAL_STRING("mousedown"),
mEventListener, false);
mContent->RemoveSystemEventListener(NS_LITERAL_STRING("mouseup"),
mEventListener, false);
mContent->RemoveSystemEventListener(NS_LITERAL_STRING("mousemove"),
mEventListener, false);
nsFormControlFrame::RegUnRegAccessKey(static_cast<nsIFrame*>(this), false);
nsHTMLScrollFrame::DestroyFrom(aDestructRoot);
}
void
nsListControlFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsRect& aDirtyRect,
const nsDisplayListSet& aLists)
{
// We allow visibility:hidden <select>s to contain visible options.
// Don't allow painting of list controls when painting is suppressed.
// XXX why do we need this here? we should never reach this. Maybe
// because these can have widgets? Hmm
if (aBuilder->IsBackgroundOnly())
return;
DO_GLOBAL_REFLOW_COUNT_DSP("nsListControlFrame");
if (IsInDropDownMode()) {
NS_ASSERTION(NS_GET_A(mLastDropdownBackstopColor) == 255,
"need an opaque backstop color");
// XXX Because we have an opaque widget and we get called to paint with
// this frame as the root of a stacking context we need make sure to draw
// some opaque color over the whole widget. (Bug 511323)
aLists.BorderBackground()->AppendNewToBottom(
new (aBuilder) nsDisplaySolidColor(aBuilder,
this, nsRect(aBuilder->ToReferenceFrame(this), GetSize()),
mLastDropdownBackstopColor));
}
nsHTMLScrollFrame::BuildDisplayList(aBuilder, aDirtyRect, aLists);
}
/**
* This is called by the SelectsAreaFrame, which is the same
* as the frame returned by GetOptionsContainer. It's the frame which is
* scrolled by us.
* @param aPt the offset of this frame, relative to the rendering reference
* frame
*/
void nsListControlFrame::PaintFocus(nsRenderingContext& aRC, nsPoint aPt)
{
if (mFocused != this) return;
nsPresContext* presContext = PresContext();
nsIFrame* containerFrame = GetOptionsContainer();
if (!containerFrame) return;
nsIFrame* childframe = nullptr;
nsCOMPtr<nsIContent> focusedContent = GetCurrentOption();
if (focusedContent) {
childframe = focusedContent->GetPrimaryFrame();
}
nsRect fRect;
if (childframe) {
// get the child rect
fRect = childframe->GetRect();
// get it into our coordinates
fRect.MoveBy(childframe->GetParent()->GetOffsetTo(this));
} else {
float inflation = nsLayoutUtils::FontSizeInflationFor(this);
fRect.x = fRect.y = 0;
if (GetWritingMode().IsVertical()) {
fRect.width = GetScrollPortRect().width;
fRect.height = CalcFallbackRowBSize(inflation);
} else {
fRect.width = CalcFallbackRowBSize(inflation);
fRect.height = GetScrollPortRect().height;
}
fRect.MoveBy(containerFrame->GetOffsetTo(this));
}
fRect += aPt;
bool lastItemIsSelected = false;
if (focusedContent) {
nsCOMPtr<nsIDOMHTMLOptionElement> domOpt =
do_QueryInterface(focusedContent);
if (domOpt) {
domOpt->GetSelected(&lastItemIsSelected);
}
}
// set up back stop colors and then ask L&F service for the real colors
nscolor color =
LookAndFeel::GetColor(lastItemIsSelected ?
LookAndFeel::eColorID_WidgetSelectForeground :
LookAndFeel::eColorID_WidgetSelectBackground);
nsCSSRendering::PaintFocus(presContext, aRC, fRect, color);
}
void
nsListControlFrame::InvalidateFocus()
{
if (mFocused != this)
return;
nsIFrame* containerFrame = GetOptionsContainer();
if (containerFrame) {
containerFrame->InvalidateFrame();
}
}
NS_QUERYFRAME_HEAD(nsListControlFrame)
NS_QUERYFRAME_ENTRY(nsIFormControlFrame)
NS_QUERYFRAME_ENTRY(nsIListControlFrame)
NS_QUERYFRAME_ENTRY(nsISelectControlFrame)
NS_QUERYFRAME_TAIL_INHERITING(nsHTMLScrollFrame)
#ifdef ACCESSIBILITY
a11y::AccType
nsListControlFrame::AccessibleType()
{
return a11y::eHTMLSelectListType;
}
#endif
static nscoord
GetMaxOptionBSize(nsIFrame* aContainer, WritingMode aWM)
{
nscoord result = 0;
for (nsIFrame* option = aContainer->GetFirstPrincipalChild();
option; option = option->GetNextSibling()) {
nscoord optionBSize;
if (nsCOMPtr<nsIDOMHTMLOptGroupElement>
(do_QueryInterface(option->GetContent()))) {
// An optgroup; drill through any scroll frame and recurse.
optionBSize = GetMaxOptionBSize(option->GetContentInsertionFrame(), aWM);
} else {
// an option
optionBSize = option->BSize(aWM);
}
if (result < optionBSize)
result = optionBSize;
}
return result;
}
//-----------------------------------------------------------------
// Main Reflow for ListBox/Dropdown
//-----------------------------------------------------------------
nscoord
nsListControlFrame::CalcBSizeOfARow()
{
// Calculate the block size in our writing mode of a single row in the
// listbox or dropdown list by using the tallest thing in the subtree,
// since there may be option groups in addition to option elements,
// either of which may be visible or invisible, may use different
// fonts, etc.
int32_t blockSizeOfARow = GetMaxOptionBSize(GetOptionsContainer(),
GetWritingMode());
// Check to see if we have zero items (and optimize by checking
// blockSizeOfARow first)
if (blockSizeOfARow == 0 && GetNumberOfOptions() == 0) {
float inflation = nsLayoutUtils::FontSizeInflationFor(this);
blockSizeOfARow = CalcFallbackRowBSize(inflation);
}
return blockSizeOfARow;
}
nscoord
nsListControlFrame::GetPrefISize(nsRenderingContext *aRenderingContext)
{
nscoord result;
DISPLAY_PREF_WIDTH(this, result);
// Always add scrollbar inline sizes to the pref-inline-size of the
// scrolled content. Combobox frames depend on this happening in the
// dropdown, and standalone listboxes are overflow:scroll so they need
// it too.
WritingMode wm = GetWritingMode();
result = GetScrolledFrame()->GetPrefISize(aRenderingContext);
LogicalMargin scrollbarSize(wm, GetDesiredScrollbarSizes(PresContext(),
aRenderingContext));
result = NSCoordSaturatingAdd(result, scrollbarSize.IStartEnd(wm));
return result;
}
nscoord
nsListControlFrame::GetMinISize(nsRenderingContext *aRenderingContext)
{
nscoord result;
DISPLAY_MIN_WIDTH(this, result);
// Always add scrollbar inline sizes to the min-inline-size of the
// scrolled content. Combobox frames depend on this happening in the
// dropdown, and standalone listboxes are overflow:scroll so they need
// it too.
WritingMode wm = GetWritingMode();
result = GetScrolledFrame()->GetMinISize(aRenderingContext);
LogicalMargin scrollbarSize(wm, GetDesiredScrollbarSizes(PresContext(),
aRenderingContext));
result += scrollbarSize.IStartEnd(wm);
return result;
}
void
nsListControlFrame::Reflow(nsPresContext* aPresContext,
nsHTMLReflowMetrics& aDesiredSize,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus)
{
NS_PRECONDITION(aReflowState.ComputedISize() != NS_UNCONSTRAINEDSIZE,
"Must have a computed inline size");
SchedulePaint();
mHasPendingInterruptAtStartOfReflow = aPresContext->HasPendingInterrupt();
// If all the content and frames are here
// then initialize it before reflow
if (mIsAllContentHere && !mHasBeenInitialized) {
if (false == mIsAllFramesHere) {
CheckIfAllFramesHere();
}
if (mIsAllFramesHere && !mHasBeenInitialized) {
mHasBeenInitialized = true;
}
}
if (GetStateBits() & NS_FRAME_FIRST_REFLOW) {
nsFormControlFrame::RegUnRegAccessKey(this, true);
}
if (IsInDropDownMode()) {
ReflowAsDropdown(aPresContext, aDesiredSize, aReflowState, aStatus);
return;
}
MarkInReflow();
/*
* Due to the fact that our intrinsic block size depends on the block
* sizes of our kids, we end up having to do two-pass reflow, in
* general -- the first pass to find the intrinsic block size and a
* second pass to reflow the scrollframe at that block size (which
* will size the scrollbars correctly, etc).
*
* Naturally, we want to avoid doing the second reflow as much as
* possible.
* We can skip it in the following cases (in all of which the first
* reflow is already happening at the right block size):
*
* - We're reflowing with a constrained computed block size -- just
* use that block size.
* - We're not dirty and have no dirty kids and shouldn't be reflowing
* all kids. In this case, our cached max block size of a child is
* not going to change.
* - We do our first reflow using our cached max block size of a
* child, then compute the new max block size and it's the same as
* the old one.
*/
bool autoBSize = (aReflowState.ComputedBSize() == NS_UNCONSTRAINEDSIZE);
mMightNeedSecondPass = autoBSize &&
(NS_SUBTREE_DIRTY(this) || aReflowState.ShouldReflowAllKids());
nsHTMLReflowState state(aReflowState);
int32_t length = GetNumberOfRows();
nscoord oldBSizeOfARow = BSizeOfARow();
if (!(GetStateBits() & NS_FRAME_FIRST_REFLOW) && autoBSize) {
// When not doing an initial reflow, and when the block size is
// auto, start off with our computed block size set to what we'd
// expect our block size to be.
nscoord computedBSize = CalcIntrinsicBSize(oldBSizeOfARow, length);
computedBSize = state.ApplyMinMaxBSize(computedBSize);
state.SetComputedBSize(computedBSize);
}
nsHTMLScrollFrame::Reflow(aPresContext, aDesiredSize, state, aStatus);
if (!mMightNeedSecondPass) {
NS_ASSERTION(!autoBSize || BSizeOfARow() == oldBSizeOfARow,
"How did our BSize of a row change if nothing was dirty?");
NS_ASSERTION(!autoBSize ||
!(GetStateBits() & NS_FRAME_FIRST_REFLOW),
"How do we not need a second pass during initial reflow at "
"auto BSize?");
NS_ASSERTION(!IsScrollbarUpdateSuppressed(),
"Shouldn't be suppressing if we don't need a second pass!");
if (!autoBSize) {
// Update our mNumDisplayRows based on our new row block size now
// that we know it. Note that if autoBSize and we landed in this
// code then we already set mNumDisplayRows in CalcIntrinsicBSize.
// Also note that we can't use BSizeOfARow() here because that
// just uses a cached value that we didn't compute.
nscoord rowBSize = CalcBSizeOfARow();
if (rowBSize == 0) {
// Just pick something
mNumDisplayRows = 1;
} else {
mNumDisplayRows = std::max(1, state.ComputedBSize() / rowBSize);
}
}
return;
}
mMightNeedSecondPass = false;
// Now see whether we need a second pass. If we do, our
// nsSelectsAreaFrame will have suppressed the scrollbar update.
if (!IsScrollbarUpdateSuppressed()) {
// All done. No need to do more reflow.
NS_ASSERTION(!IsScrollbarUpdateSuppressed(),
"Shouldn't be suppressing if the block size of a row has not "
"changed!");
return;
}
SetSuppressScrollbarUpdate(false);
// Gotta reflow again.
// XXXbz We're just changing the block size here; do we need to dirty
// ourselves or anything like that? We might need to, per the letter
// of the reflow protocol, but things seem to work fine without it...
// Is that just an implementation detail of nsHTMLScrollFrame that
// we're depending on?
nsHTMLScrollFrame::DidReflow(aPresContext, &state,
nsDidReflowStatus::FINISHED);
// Now compute the block size we want to have
nscoord computedBSize = CalcIntrinsicBSize(BSizeOfARow(), length);
computedBSize = state.ApplyMinMaxBSize(computedBSize);
state.SetComputedBSize(computedBSize);
// XXXbz to make the ascent really correct, we should add our
// mComputedPadding.top to it (and subtract it from descent). Need that
// because nsGfxScrollFrame just adds in the border....
nsHTMLScrollFrame::Reflow(aPresContext, aDesiredSize, state, aStatus);
}
void
nsListControlFrame::ReflowAsDropdown(nsPresContext* aPresContext,
nsHTMLReflowMetrics& aDesiredSize,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus)
{
NS_PRECONDITION(aReflowState.ComputedBSize() == NS_UNCONSTRAINEDSIZE,
"We should not have a computed block size here!");
mMightNeedSecondPass = NS_SUBTREE_DIRTY(this) ||
aReflowState.ShouldReflowAllKids();
WritingMode wm = aReflowState.GetWritingMode();
#ifdef DEBUG
nscoord oldBSizeOfARow = BSizeOfARow();
nscoord oldVisibleBSize = (GetStateBits() & NS_FRAME_FIRST_REFLOW) ?
NS_UNCONSTRAINEDSIZE : GetScrolledFrame()->BSize(wm);
#endif
nsHTMLReflowState state(aReflowState);
if (!(GetStateBits() & NS_FRAME_FIRST_REFLOW)) {
// When not doing an initial reflow, and when the block size is
// auto, start off with our computed block size set to what we'd
// expect our block size to be.
// Note: At this point, mLastDropdownComputedBSize can be
// NS_UNCONSTRAINEDSIZE in cases when last time we didn't have to
// constrain the block size. That's fine; just do the same thing as
// last time.
state.SetComputedBSize(mLastDropdownComputedBSize);
}
nsHTMLScrollFrame::Reflow(aPresContext, aDesiredSize, state, aStatus);
if (!mMightNeedSecondPass) {
NS_ASSERTION(oldVisibleBSize == GetScrolledFrame()->BSize(wm),
"How did our kid's BSize change if nothing was dirty?");
NS_ASSERTION(BSizeOfARow() == oldBSizeOfARow,
"How did our BSize of a row change if nothing was dirty?");
NS_ASSERTION(!IsScrollbarUpdateSuppressed(),
"Shouldn't be suppressing if we don't need a second pass!");
NS_ASSERTION(!(GetStateBits() & NS_FRAME_FIRST_REFLOW),
"How can we avoid a second pass during first reflow?");
return;
}
mMightNeedSecondPass = false;
// Now see whether we need a second pass. If we do, our nsSelectsAreaFrame
// will have suppressed the scrollbar update.
if (!IsScrollbarUpdateSuppressed()) {
// All done. No need to do more reflow.
NS_ASSERTION(!(GetStateBits() & NS_FRAME_FIRST_REFLOW),
"How can we avoid a second pass during first reflow?");
return;
}
SetSuppressScrollbarUpdate(false);
nscoord visibleBSize = GetScrolledFrame()->BSize(wm);
nscoord blockSizeOfARow = BSizeOfARow();
// Gotta reflow again.
// XXXbz We're just changing the block size here; do we need to dirty
// ourselves or anything like that? We might need to, per the letter
// of the reflow protocol, but things seem to work fine without it...
// Is that just an implementation detail of nsHTMLScrollFrame that
// we're depending on?
nsHTMLScrollFrame::DidReflow(aPresContext, &state,
nsDidReflowStatus::FINISHED);
// Now compute the block size we want to have.
// Note: no need to apply min/max constraints, since we have no such
// rules applied to the combobox dropdown.
mDropdownCanGrow = false;
if (visibleBSize <= 0 || blockSizeOfARow <= 0) {
// Looks like we have no options. Just size us to a single row
// block size.
state.SetComputedBSize(blockSizeOfARow);
mNumDisplayRows = 1;
} else {
nsComboboxControlFrame* combobox =
static_cast<nsComboboxControlFrame*>(mComboboxFrame);
LogicalPoint translation(wm);
nscoord before, after;
combobox->GetAvailableDropdownSpace(wm, &before, &after, &translation);
if (before <= 0 && after <= 0) {
state.SetComputedBSize(blockSizeOfARow);
mNumDisplayRows = 1;
mDropdownCanGrow = GetNumberOfRows() > 1;
} else {
nscoord bp = aReflowState.ComputedLogicalBorderPadding().BStartEnd(wm);
nscoord availableBSize = std::max(before, after) - bp;
nscoord newBSize;
uint32_t rows;
if (visibleBSize <= availableBSize) {
// The dropdown fits in the available block size.
rows = GetNumberOfRows();
mNumDisplayRows = clamped<uint32_t>(rows, 1, kMaxDropDownRows);
if (mNumDisplayRows == rows) {
newBSize = visibleBSize; // use the exact block size
} else {
newBSize = mNumDisplayRows * blockSizeOfARow; // approximate
// The approximation here might actually be too big (bug 1208978);
// don't let it exceed the actual block-size of the list.
newBSize = std::min(newBSize, visibleBSize);
}
} else {
rows = availableBSize / blockSizeOfARow;
mNumDisplayRows = clamped<uint32_t>(rows, 1, kMaxDropDownRows);
newBSize = mNumDisplayRows * blockSizeOfARow; // approximate
}
state.SetComputedBSize(newBSize);
mDropdownCanGrow = visibleBSize - newBSize >= blockSizeOfARow &&
mNumDisplayRows != kMaxDropDownRows;
}
}
mLastDropdownComputedBSize = state.ComputedBSize();
nsHTMLScrollFrame::Reflow(aPresContext, aDesiredSize, state, aStatus);
}
ScrollbarStyles
nsListControlFrame::GetScrollbarStyles() const
{
// We can't express this in the style system yet; when we can, this can go away
// and GetScrollbarStyles can be devirtualized
int32_t style = IsInDropDownMode() ? NS_STYLE_OVERFLOW_AUTO
: NS_STYLE_OVERFLOW_SCROLL;
if (GetWritingMode().IsVertical()) {
return ScrollbarStyles(style, NS_STYLE_OVERFLOW_HIDDEN);
} else {
return ScrollbarStyles(NS_STYLE_OVERFLOW_HIDDEN, style);
}
}
bool
nsListControlFrame::ShouldPropagateComputedBSizeToScrolledContent() const
{
return !IsInDropDownMode();
}
//---------------------------------------------------------
nsContainerFrame*
nsListControlFrame::GetContentInsertionFrame() {
return GetOptionsContainer()->GetContentInsertionFrame();
}
//---------------------------------------------------------
bool
nsListControlFrame::ExtendedSelection(int32_t aStartIndex,
int32_t aEndIndex,
bool aClearAll)
{
return SetOptionsSelectedFromFrame(aStartIndex, aEndIndex,
true, aClearAll);
}
//---------------------------------------------------------
bool
nsListControlFrame::SingleSelection(int32_t aClickedIndex, bool aDoToggle)
{
if (mComboboxFrame) {
mComboboxFrame->UpdateRecentIndex(GetSelectedIndex());
}
bool wasChanged = false;
// Get Current selection
if (aDoToggle) {
wasChanged = ToggleOptionSelectedFromFrame(aClickedIndex);
} else {
wasChanged = SetOptionsSelectedFromFrame(aClickedIndex, aClickedIndex,
true, true);
}
nsWeakFrame weakFrame(this);
ScrollToIndex(aClickedIndex);
if (!weakFrame.IsAlive()) {
return wasChanged;
}
#ifdef ACCESSIBILITY
bool isCurrentOptionChanged = mEndSelectionIndex != aClickedIndex;
#endif
mStartSelectionIndex = aClickedIndex;
mEndSelectionIndex = aClickedIndex;
InvalidateFocus();
#ifdef ACCESSIBILITY
if (isCurrentOptionChanged) {
FireMenuItemActiveEvent();
}
#endif
return wasChanged;
}
void
nsListControlFrame::InitSelectionRange(int32_t aClickedIndex)
{
//
// If nothing is selected, set the start selection depending on where
// the user clicked and what the initial selection is:
// - if the user clicked *before* selectedIndex, set the start index to
// the end of the first contiguous selection.
// - if the user clicked *after* the end of the first contiguous
// selection, set the start index to selectedIndex.
// - if the user clicked *within* the first contiguous selection, set the
// start index to selectedIndex.
// The last two rules, of course, boil down to the same thing: if the user
// clicked >= selectedIndex, return selectedIndex.
//
// This makes it so that shift click works properly when you first click
// in a multiple select.
//
int32_t selectedIndex = GetSelectedIndex();
if (selectedIndex >= 0) {
// Get the end of the contiguous selection
RefPtr<dom::HTMLOptionsCollection> options = GetOptions();
NS_ASSERTION(options, "Collection of options is null!");
uint32_t numOptions = options->Length();
// Push i to one past the last selected index in the group.
uint32_t i;
for (i = selectedIndex + 1; i < numOptions; i++) {
if (!options->ItemAsOption(i)->Selected()) {
break;
}
}
if (aClickedIndex < selectedIndex) {
// User clicked before selection, so start selection at end of
// contiguous selection
mStartSelectionIndex = i-1;
mEndSelectionIndex = selectedIndex;
} else {
// User clicked after selection, so start selection at start of
// contiguous selection
mStartSelectionIndex = selectedIndex;
mEndSelectionIndex = i-1;
}
}
}
static uint32_t
CountOptionsAndOptgroups(nsIFrame* aFrame)
{
uint32_t count = 0;
nsFrameList::Enumerator e(aFrame->PrincipalChildList());
for (; !e.AtEnd(); e.Next()) {
nsIFrame* child = e.get();
nsIContent* content = child->GetContent();
if (content) {
if (content->IsHTMLElement(nsGkAtoms::option)) {
++count;
} else {
nsCOMPtr<nsIDOMHTMLOptGroupElement> optgroup = do_QueryInterface(content);
if (optgroup) {
nsAutoString label;
optgroup->GetLabel(label);
if (label.Length() > 0) {
++count;
}
count += CountOptionsAndOptgroups(child);
}
}
}
}
return count;
}
uint32_t
nsListControlFrame::GetNumberOfRows()
{
return ::CountOptionsAndOptgroups(GetContentInsertionFrame());
}
//---------------------------------------------------------
bool
nsListControlFrame::PerformSelection(int32_t aClickedIndex,
bool aIsShift,
bool aIsControl)
{
bool wasChanged = false;
if (aClickedIndex == kNothingSelected && !mForceSelection) {
// Ignore kNothingSelected unless the selection is forced
} else if (GetMultiple()) {
if (aIsShift) {
// Make sure shift+click actually does something expected when
// the user has never clicked on the select
if (mStartSelectionIndex == kNothingSelected) {
InitSelectionRange(aClickedIndex);
}
// Get the range from beginning (low) to end (high)
// Shift *always* works, even if the current option is disabled
int32_t startIndex;
int32_t endIndex;
if (mStartSelectionIndex == kNothingSelected) {
startIndex = aClickedIndex;
endIndex = aClickedIndex;
} else if (mStartSelectionIndex <= aClickedIndex) {
startIndex = mStartSelectionIndex;
endIndex = aClickedIndex;
} else {
startIndex = aClickedIndex;
endIndex = mStartSelectionIndex;
}
// Clear only if control was not pressed
wasChanged = ExtendedSelection(startIndex, endIndex, !aIsControl);
nsWeakFrame weakFrame(this);
ScrollToIndex(aClickedIndex);
if (!weakFrame.IsAlive()) {
return wasChanged;
}
if (mStartSelectionIndex == kNothingSelected) {
mStartSelectionIndex = aClickedIndex;
}
#ifdef ACCESSIBILITY
bool isCurrentOptionChanged = mEndSelectionIndex != aClickedIndex;
#endif
mEndSelectionIndex = aClickedIndex;
InvalidateFocus();
#ifdef ACCESSIBILITY
if (isCurrentOptionChanged) {
FireMenuItemActiveEvent();
}
#endif
} else if (aIsControl) {
wasChanged = SingleSelection(aClickedIndex, true); // might destroy us
} else {
wasChanged = SingleSelection(aClickedIndex, false); // might destroy us
}
} else {
wasChanged = SingleSelection(aClickedIndex, false); // might destroy us
}
return wasChanged;
}
//---------------------------------------------------------
bool
nsListControlFrame::HandleListSelection(nsIDOMEvent* aEvent,
int32_t aClickedIndex)
{
nsCOMPtr<nsIDOMMouseEvent> mouseEvent = do_QueryInterface(aEvent);
bool isShift;
bool isControl;
#ifdef XP_MACOSX
mouseEvent->GetMetaKey(&isControl);
#else
mouseEvent->GetCtrlKey(&isControl);
#endif
mouseEvent->GetShiftKey(&isShift);
return PerformSelection(aClickedIndex, isShift, isControl); // might destroy us
}
//---------------------------------------------------------
void
nsListControlFrame::CaptureMouseEvents(bool aGrabMouseEvents)
{
// Currently cocoa widgets use a native popup widget which tracks clicks synchronously,
// so we never want to do mouse capturing. Note that we only bail if the list
// is in drop-down mode, and the caller is requesting capture (we let release capture
// requests go through to ensure that we can release capture requested via other
// code paths, if any exist).
if (aGrabMouseEvents && IsInDropDownMode() && nsComboboxControlFrame::ToolkitHasNativePopup())
return;
if (aGrabMouseEvents) {
nsIPresShell::SetCapturingContent(mContent, CAPTURE_IGNOREALLOWED);
} else {
nsIContent* capturingContent = nsIPresShell::GetCapturingContent();
bool dropDownIsHidden = false;
if (IsInDropDownMode()) {
dropDownIsHidden = !mComboboxFrame->IsDroppedDown();
}
if (capturingContent == mContent || dropDownIsHidden) {
// only clear the capturing content if *we* are the ones doing the
// capturing (or if the dropdown is hidden, in which case NO-ONE should
// be capturing anything - it could be a scrollbar inside this listbox
// which is actually grabbing
// This shouldn't be necessary. We should simply ensure that events targeting
// scrollbars are never visible to DOM consumers.
nsIPresShell::SetCapturingContent(nullptr, 0);
}
}
}
//---------------------------------------------------------
nsresult
nsListControlFrame::HandleEvent(nsPresContext* aPresContext,
WidgetGUIEvent* aEvent,
nsEventStatus* aEventStatus)
{
NS_ENSURE_ARG_POINTER(aEventStatus);
/*const char * desc[] = {"eMouseMove",
"NS_MOUSE_LEFT_BUTTON_UP",
"NS_MOUSE_LEFT_BUTTON_DOWN",
"<NA>","<NA>","<NA>","<NA>","<NA>","<NA>","<NA>",
"NS_MOUSE_MIDDLE_BUTTON_UP",
"NS_MOUSE_MIDDLE_BUTTON_DOWN",
"<NA>","<NA>","<NA>","<NA>","<NA>","<NA>","<NA>","<NA>",
"NS_MOUSE_RIGHT_BUTTON_UP",
"NS_MOUSE_RIGHT_BUTTON_DOWN",
"eMouseOver",
"eMouseOut",
"NS_MOUSE_LEFT_DOUBLECLICK",
"NS_MOUSE_MIDDLE_DOUBLECLICK",
"NS_MOUSE_RIGHT_DOUBLECLICK",
"NS_MOUSE_LEFT_CLICK",
"NS_MOUSE_MIDDLE_CLICK",
"NS_MOUSE_RIGHT_CLICK"};
int inx = aEvent->mMessage - eMouseEventFirst;
if (inx >= 0 && inx <= (NS_MOUSE_RIGHT_CLICK - eMouseEventFirst)) {
printf("Mouse in ListFrame %s [%d]\n", desc[inx], aEvent->mMessage);
} else {
printf("Mouse in ListFrame <UNKNOWN> [%d]\n", aEvent->mMessage);
}*/
if (nsEventStatus_eConsumeNoDefault == *aEventStatus)
return NS_OK;
// do we have style that affects how we are selected?
// do we have user-input style?
const nsStyleUserInterface* uiStyle = StyleUserInterface();
if (uiStyle->mUserInput == NS_STYLE_USER_INPUT_NONE || uiStyle->mUserInput == NS_STYLE_USER_INPUT_DISABLED)
return nsFrame::HandleEvent(aPresContext, aEvent, aEventStatus);
EventStates eventStates = mContent->AsElement()->State();
if (eventStates.HasState(NS_EVENT_STATE_DISABLED))
return NS_OK;
return nsHTMLScrollFrame::HandleEvent(aPresContext, aEvent, aEventStatus);
}
//---------------------------------------------------------
void
nsListControlFrame::SetInitialChildList(ChildListID aListID,
nsFrameList& aChildList)
{
// First check to see if all the content has been added
mIsAllContentHere = mContent->IsDoneAddingChildren();
if (!mIsAllContentHere) {
mIsAllFramesHere = false;
mHasBeenInitialized = false;
}
nsHTMLScrollFrame::SetInitialChildList(aListID, aChildList);
// If all the content is here now check
// to see if all the frames have been created
/*if (mIsAllContentHere) {
// If all content and frames are here
// the reset/initialize
if (CheckIfAllFramesHere()) {
ResetList(aPresContext);
mHasBeenInitialized = true;
}
}*/
}
//---------------------------------------------------------
void
nsListControlFrame::Init(nsIContent* aContent,
nsContainerFrame* aParent,
nsIFrame* aPrevInFlow)
{
nsHTMLScrollFrame::Init(aContent, aParent, aPrevInFlow);
// we shouldn't have to unregister this listener because when
// our frame goes away all these content node go away as well
// because our frame is the only one who references them.
// we need to hook up our listeners before the editor is initialized
mEventListener = new nsListEventListener(this);
mContent->AddSystemEventListener(NS_LITERAL_STRING("keydown"),
mEventListener, false, false);
mContent->AddSystemEventListener(NS_LITERAL_STRING("keypress"),
mEventListener, false, false);
mContent->AddSystemEventListener(NS_LITERAL_STRING("mousedown"),
mEventListener, false, false);
mContent->AddSystemEventListener(NS_LITERAL_STRING("mouseup"),
mEventListener, false, false);
mContent->AddSystemEventListener(NS_LITERAL_STRING("mousemove"),
mEventListener, false, false);
mStartSelectionIndex = kNothingSelected;
mEndSelectionIndex = kNothingSelected;
mLastDropdownBackstopColor = PresContext()->DefaultBackgroundColor();
if (IsInDropDownMode()) {
AddStateBits(NS_FRAME_IN_POPUP);
}
}
dom::HTMLOptionsCollection*
nsListControlFrame::GetOptions() const
{
dom::HTMLSelectElement* select =
dom::HTMLSelectElement::FromContentOrNull(mContent);
NS_ENSURE_TRUE(select, nullptr);
return select->Options();
}
dom::HTMLOptionElement*
nsListControlFrame::GetOption(uint32_t aIndex) const
{