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/* -*- 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 */
#ifndef nsComboboxControlFrame_h___
#define nsComboboxControlFrame_h___
#include "mozilla/Attributes.h"
#include "nsIFormControlFrame.h"
#include "nsIAnonymousContentCreator.h"
#include "nsISelectControlFrame.h"
#include "nsIRollupListener.h"
#include "nsThreadUtils.h"
#include "nsHTMLButtonControlFrame.h"
namespace mozilla {
class PresShell;
class HTMLSelectEventListener;
class ComboboxLabelFrame;
namespace dom {
class HTMLSelectElement;
} // namespace mozilla
class nsComboboxControlFrame final : public nsHTMLButtonControlFrame,
public nsIAnonymousContentCreator,
public nsISelectControlFrame {
using Element = mozilla::dom::Element;
friend class mozilla::ComboboxLabelFrame;
explicit nsComboboxControlFrame(ComputedStyle* aStyle,
nsPresContext* aPresContext);
// nsIAnonymousContentCreator
nsresult CreateAnonymousContent(nsTArray<ContentInfo>& aElements) final;
void AppendAnonymousContentTo(nsTArray<nsIContent*>& aElements,
uint32_t aFilter) final;
mozilla::a11y::AccType AccessibleType() final;
nscoord GetMinISize(gfxContext* aRenderingContext) final;
nscoord GetPrefISize(gfxContext* aRenderingContext) final;
// We're a leaf, so we need to report ourselves as the content insertion
// frame.
nsContainerFrame* GetContentInsertionFrame() override { return this; }
void Reflow(nsPresContext* aCX, ReflowOutput& aDesiredSize,
const ReflowInput& aReflowInput, nsReflowStatus& aStatus) final;
nsresult HandleEvent(nsPresContext* aPresContext,
mozilla::WidgetGUIEvent* aEvent,
nsEventStatus* aEventStatus) final;
void Init(nsIContent* aContent, nsContainerFrame* aParent,
nsIFrame* aPrevInFlow) final;
void Destroy(DestroyContext&) final;
nsresult GetFrameName(nsAString& aResult) const final {
return MakeFrameName(u"ComboboxControl"_ns, aResult);
// nsIFormControlFrame
nsresult SetFormProperty(nsAtom* aName, const nsAString& aValue) final {
return NS_OK;
* @note This method might destroy |this|.
void FireValueChangeEvent();
nsresult RedisplaySelectedText();
bool IsDroppedDown() const;
// nsISelectControlFrame
NS_IMETHOD AddOption(int32_t index) final;
NS_IMETHOD RemoveOption(int32_t index) final;
NS_IMETHOD DoneAddingChildren(bool aIsDone) final;
NS_IMETHOD OnOptionSelected(int32_t aIndex, bool aSelected) final;
OnSetSelectedIndex(int32_t aOldIndex, int32_t aNewIndex) final;
int32_t CharCountOfLargestOptionForInflation() const;
friend class RedisplayTextEvent;
friend class nsAsyncResize;
friend class nsResizeDropdownAtFinalPosition;
// Return true if we should render a dropdown button.
bool HasDropDownButton() const;
nscoord DropDownButtonISize();
enum DropDownPositionState {
// can't show the dropdown at its current position
// a resize reflow is pending, don't show it yet
// the dropdown has its final size and position and can be displayed here
DropDownPositionState AbsolutelyPositionDropDown();
nscoord GetLongestOptionISize(gfxContext*) const;
// Helper for GetMinISize/GetPrefISize
nscoord IntrinsicISize(gfxContext* aRenderingContext,
mozilla::IntrinsicISizeType aType);
class RedisplayTextEvent : public mozilla::Runnable {
explicit RedisplayTextEvent(nsComboboxControlFrame* c)
: mozilla::Runnable("nsComboboxControlFrame::RedisplayTextEvent"),
mControlFrame(c) {}
void Revoke() { mControlFrame = nullptr; }
nsComboboxControlFrame* mControlFrame;
nsresult RedisplayText();
void HandleRedisplayTextEvent();
void ActuallyDisplayText(bool aNotify);
mozilla::dom::HTMLSelectElement& Select() const;
void GetOptionText(uint32_t aIndex, nsAString& aText) const;
RefPtr<Element> mDisplayLabel; // Anonymous content for the label
RefPtr<Element> mButtonContent; // Anonymous content for the button
nsRevocableEventPtr<RedisplayTextEvent> mRedisplayTextEvent;
// The inline size of our display area. Used by that frame's reflow to size to
// the full inline size except the drop-marker.
nscoord mDisplayISize = 0;
int32_t mDisplayedIndex = -1;
nsString mDisplayedOptionTextOrPreview;
RefPtr<mozilla::HTMLSelectEventListener> mEventListener;