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gecko-dev/widget/LookAndFeel.h

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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/. */
#ifndef __LookAndFeel
#define __LookAndFeel
#ifndef MOZILLA_INTERNAL_API
# error "This header is only usable from within libxul (MOZILLA_INTERNAL_API)."
#endif
#include "nsDebug.h"
#include "nsColor.h"
#include "nsString.h"
#include "nsTArray.h"
#include "mozilla/Maybe.h"
#include "mozilla/widget/ThemeChangeKind.h"
#include "mozilla/ColorScheme.h"
struct gfxFontStyle;
class nsIFrame;
namespace mozilla {
using Modifiers = uint16_t;
struct StyleColorSchemeFlags;
namespace dom {
class Document;
}
namespace widget {
class FullLookAndFeel;
} // namespace widget
enum class StyleSystemColor : uint8_t;
enum class StyleSystemColorScheme : uint8_t;
enum class StyleSystemFont : uint8_t;
class LookAndFeel {
public:
using ColorID = StyleSystemColor;
using ColorScheme = mozilla::ColorScheme;
// When modifying this list, also modify nsXPLookAndFeel::sIntPrefs
// in widget/xpwidgts/nsXPLookAndFeel.cpp.
enum class IntID {
// default, may be overriden by OS
CaretBlinkTime,
// Amount of blinks that happen before the caret stops blinking.
CaretBlinkCount,
// pixel width of caret
CaretWidth,
// show the caret when text is selected?
ShowCaretDuringSelection,
// select textfields when focused via tab/accesskey?
SelectTextfieldsOnKeyFocus,
// delay before submenus open
SubmenuDelay,
// can popups overlap menu/task bar?
MenusCanOverlapOSBar,
// should overlay scrollbars be used?
UseOverlayScrollbars,
// allow H and V overlay scrollbars to overlap?
AllowOverlayScrollbarsOverlap,
// skip navigating to disabled menu item?
SkipNavigatingDisabledMenuItem,
// begin a drag if the mouse is moved further than the threshold while the
// button is down
DragThresholdX,
DragThresholdY,
// Accessibility theme being used?
UseAccessibilityTheme,
// position of scroll arrows in a scrollbar
ScrollArrowStyle,
// each button can take one of four values:
ScrollButtonLeftMouseButtonAction,
// 0 - scrolls one line, 1 - scrolls one page
ScrollButtonMiddleMouseButtonAction,
// 2 - scrolls to end, 3 - button ignored
ScrollButtonRightMouseButtonAction,
// delay for opening spring loaded folders
TreeOpenDelay,
// delay for closing spring loaded folders
TreeCloseDelay,
// delay for triggering the tree scrolling
TreeLazyScrollDelay,
// delay for scrolling the tree
TreeScrollDelay,
// the maximum number of lines to be scrolled at ones
TreeScrollLinesMax,
// What type of tab-order to use
TabFocusModel,
// Should menu items blink when they're chosen?
ChosenMenuItemsShouldBlink,
// Whether to always show access keys and focus rings.
ShowKeyboardCues,
/*
* A Boolean value to determine whether the Windows accent color
* should be applied to the title bar.
*
* The value of this metric is not used on other platforms. These platforms
* should return NS_ERROR_NOT_IMPLEMENTED when queried for this metric.
*/
WindowsAccentColorInTitlebar,
/*
* A Boolean value to determine whether the Windows default theme is
* being used.
*
* The value of this metric is not used on other platforms. These platforms
* should return NS_ERROR_NOT_IMPLEMENTED when queried for this metric.
*/
WindowsDefaultTheme,
/*
* A Boolean value to determine whether the DWM compositor is being used
*
* This metric is not used on non-Windows platforms. These platforms
* should return NS_ERROR_NOT_IMPLEMENTED when queried for this metric.
*/
DWMCompositor,
/*
* A Boolean value to determine whether Windows is themed (Classic vs.
* uxtheme)
*
* This is Windows-specific and is not implemented on other platforms
* (will return the default of NS_ERROR_FAILURE).
*/
WindowsClassic,
/*
* A Boolean value to determine whether the current Windows desktop theme
* supports Aero Glass.
*
* This is Windows-specific and is not implemented on other platforms
* (will return the default of NS_ERROR_FAILURE).
*/
WindowsGlass,
/*
* A Boolean value to determine whether the Mac graphite theme is
* being used.
*/
MacGraphiteTheme,
/*
* A Boolean value to determine whether the macOS Big Sur-specific
* theming should be used.
*/
MacBigSurTheme,
/*
* A Boolean value to determine whether macOS is in RTL mode or not.
*/
MacRTL,
/*
* AlertNotificationOrigin indicates from which corner of the
* screen alerts slide in, and from which direction (horizontal/vertical).
* 0, the default, represents bottom right, sliding vertically.
* Use any bitwise combination of the following constants:
* NS_ALERT_HORIZONTAL (1), NS_ALERT_LEFT (2), NS_ALERT_TOP (4).
*
* 6 4
* +-----------+
* 7| |5
* | |
* 3| |1
* +-----------+
* 2 0
*/
AlertNotificationOrigin,
/**
* If true, clicking on a scrollbar (not as in dragging the thumb) defaults
* to scrolling the view corresponding to the clicked point. Otherwise, we
* only do so if the scrollbar is clicked using the middle mouse button or
* if shift is pressed when the scrollbar is clicked.
*/
ScrollToClick,
/**
* IME and spell checker underline styles, the values should be
* NS_DECORATION_LINE_STYLE_*. They are defined below.
*/
IMERawInputUnderlineStyle,
IMESelectedRawTextUnderlineStyle,
IMEConvertedTextUnderlineStyle,
IMESelectedConvertedTextUnderline,
SpellCheckerUnderlineStyle,
/**
* If this metric != 0, support window dragging on the menubar.
*/
MenuBarDrag,
/**
* 0: scrollbar button repeats to scroll only when cursor is on the button.
* 1: scrollbar button repeats to scroll even if cursor is outside of it.
*/
ScrollbarButtonAutoRepeatBehavior,
/**
* Delay before showing a tooltip.
*/
TooltipDelay,
/*
* A Boolean value to determine whether swipe animations should be used.
*/
SwipeAnimationEnabled,
/*
* Controls whether overlay scrollbars display when the user moves
* the mouse in a scrollable frame.
*/
ScrollbarDisplayOnMouseMove,
/*
* Overlay scrollbar animation constants.
*/
ScrollbarFadeBeginDelay,
ScrollbarFadeDuration,
/**
* Distance in pixels to offset the context menu from the cursor
* on open.
*/
ContextMenuOffsetVertical,
ContextMenuOffsetHorizontal,
/*
* A boolean value indicating whether client-side decorations are
* supported by the user's GTK version.
*/
GTKCSDAvailable,
/*
* A boolean value indicating whether client-side decorations should
* contain a minimize button.
*/
GTKCSDMinimizeButton,
/*
* A boolean value indicating whether client-side decorations should
* contain a maximize button.
*/
GTKCSDMaximizeButton,
/*
* A boolean value indicating whether client-side decorations should
* contain a close button.
*/
GTKCSDCloseButton,
/**
* An Integer value that will represent the position of the Minimize button
* in GTK Client side decoration header.
*/
GTKCSDMinimizeButtonPosition,
/**
* An Integer value that will represent the position of the Maximize button
* in GTK Client side decoration header.
*/
GTKCSDMaximizeButtonPosition,
/**
* An Integer value that will represent the position of the Close button
* in GTK Client side decoration header.
*/
GTKCSDCloseButtonPosition,
/*
* A boolean value indicating whether titlebar buttons are located
* in left titlebar corner.
*/
GTKCSDReversedPlacement,
/*
* A boolean value indicating whether or not the OS is using a dark theme,
* which we may want to switch to as well if not overridden by the user.
*/
SystemUsesDarkTheme,
/**
* Corresponding to prefers-reduced-motion.
* https://drafts.csswg.org/mediaqueries-5/#prefers-reduced-motion
* 0: no-preference
* 1: reduce
*/
PrefersReducedMotion,
/**
* Corresponding to PointerCapabilities in ServoTypes.h
* 0: None
* 1: Coarse
* 2: Fine
* 4: Hover
*/
PrimaryPointerCapabilities,
/**
* Corresponding to union of PointerCapabilities values in ServoTypes.h
* E.g. if there is a mouse and a digitizer, the value will be
* 'Coarse | Fine | Hover'.
*/
AllPointerCapabilities,
/** The scrollbar size, in CSS pixels. */
SystemScrollbarSize,
/** A boolean value to determine whether a touch device is present */
TouchDeviceSupportPresent,
/** GTK titlebar radius */
TitlebarRadius,
/** GTK menu radius */
GtkMenuRadius,
/**
* Corresponding to dynamic-range.
* https://drafts.csswg.org/mediaqueries-5/#dynamic-range
* 0: Standard
* 1: High
*/
DynamicRange,
VideoDynamicRange,
/** Whether XUL panel animations are enabled. */
PanelAnimations,
/*
* Not an ID; used to define the range of valid IDs. Must be last.
*/
End,
};
// This is a common enough integer that seems worth the shortcut.
static bool UseOverlayScrollbars() {
return GetInt(IntID::UseOverlayScrollbars);
}
// Returns keyCode value of a modifier key which is used for accesskey.
// Returns 0 if the platform doesn't support access key.
static uint32_t GetMenuAccessKey();
// Modifier mask for the menu accesskey.
static Modifiers GetMenuAccessKeyModifiers();
enum {
eScrollArrow_None = 0,
eScrollArrow_StartBackward = 0x1000,
eScrollArrow_StartForward = 0x0100,
eScrollArrow_EndBackward = 0x0010,
eScrollArrow_EndForward = 0x0001
};
enum {
// single arrow at each end
eScrollArrowStyle_Single =
eScrollArrow_StartBackward | eScrollArrow_EndForward,
// both arrows at bottom/right, none at top/left
eScrollArrowStyle_BothAtBottom =
eScrollArrow_EndBackward | eScrollArrow_EndForward,
// both arrows at both ends
eScrollArrowStyle_BothAtEachEnd =
eScrollArrow_EndBackward | eScrollArrow_EndForward |
eScrollArrow_StartBackward | eScrollArrow_StartForward,
// both arrows at top/left, none at bottom/right
eScrollArrowStyle_BothAtTop =
eScrollArrow_StartBackward | eScrollArrow_StartForward
};
// When modifying this list, also modify nsXPLookAndFeel::sFloatPrefs
// in widget/nsXPLookAndFeel.cpp.
enum class FloatID {
IMEUnderlineRelativeSize,
SpellCheckerUnderlineRelativeSize,
// The width/height ratio of the cursor. If used, the CaretWidth int metric
// should be added to the calculated caret width.
CaretAspectRatio,
// GTK text scale factor.
TextScaleFactor,
// Mouse pointer scaling factor.
CursorScale,
// Not an ID; used to define the range of valid IDs. Must be last.
End,
};
using FontID = mozilla::StyleSystemFont;
static bool WindowsNonNativeMenusEnabled();
static ColorScheme SystemColorScheme() {
return GetInt(IntID::SystemUsesDarkTheme) ? ColorScheme::Dark
: ColorScheme::Light;
}
static bool IsDarkColor(nscolor);
enum class ChromeColorSchemeSetting { Light, Dark, System };
static ChromeColorSchemeSetting ColorSchemeSettingForChrome();
static ColorScheme ThemeDerivedColorSchemeForContent();
static ColorScheme ColorSchemeForChrome() {
MOZ_ASSERT(sColorSchemeInitialized);
return sChromeColorScheme;
}
static ColorScheme PreferredColorSchemeForContent() {
MOZ_ASSERT(sColorSchemeInitialized);
return sContentColorScheme;
}
static ColorScheme ColorSchemeForStyle(
const dom::Document&, const StyleColorSchemeFlags&,
ColorSchemeMode = ColorSchemeMode::Used);
static ColorScheme ColorSchemeForFrame(
const nsIFrame*, ColorSchemeMode = ColorSchemeMode::Used);
// Whether standins for native colors should be used (that is, colors faked,
// taken from win7, mostly). This forces light appearance, effectively.
enum class UseStandins : bool { No, Yes };
static UseStandins ShouldUseStandins(const dom::Document&, ColorID);
// Returns a native color value (might be overwritten by prefs) for a given
// color id.
//
// NOTE:
// ColorID::TextSelectForeground might return NS_SAME_AS_FOREGROUND_COLOR.
// ColorID::IME* might return NS_TRANSPARENT, NS_SAME_AS_FOREGROUND_COLOR or
// NS_40PERCENT_FOREGROUND_COLOR.
// These values have particular meaning. Then, they are not an actual
// color value.
static Maybe<nscolor> GetColor(ColorID, ColorScheme, UseStandins);
// Gets the color with appropriate defaults for UseStandins, ColorScheme etc
// for a given frame.
static Maybe<nscolor> GetColor(ColorID, const nsIFrame*);
// Versions of the above which returns the color if found, or a default (which
// defaults to opaque black) otherwise.
static nscolor Color(ColorID aId, ColorScheme aScheme,
UseStandins aUseStandins,
nscolor aDefault = NS_RGB(0, 0, 0)) {
return GetColor(aId, aScheme, aUseStandins).valueOr(aDefault);
}
static nscolor Color(ColorID aId, nsIFrame* aFrame,
nscolor aDefault = NS_RGB(0, 0, 0)) {
return GetColor(aId, aFrame).valueOr(aDefault);
}
static float GetTextScaleFactor() {
float f = GetFloat(FloatID::TextScaleFactor, 1.0f);
if (MOZ_UNLIKELY(f <= 0.0f)) {
return 1.0f;
}
return f;
}
struct ZoomSettings {
float mFullZoom = 1.0f;
float mTextZoom = 1.0f;
};
static ZoomSettings SystemZoomSettings();
/**
* GetInt() and GetFloat() return a int or float value for aID. The result
* might be distance, time, some flags or a int value which has particular
* meaning. See each document at definition of each ID for the detail.
* The result is always 0 when they return error. Therefore, if you want to
* use a value for the default value, you should use the other method which
* returns int or float directly.
*/
static nsresult GetInt(IntID, int32_t* aResult);
static nsresult GetFloat(FloatID aID, float* aResult);
static int32_t GetInt(IntID aID, int32_t aDefault = 0) {
int32_t result;
if (NS_FAILED(GetInt(aID, &result))) {
return aDefault;
}
return result;
}
static float GetFloat(FloatID aID, float aDefault = 0.0f) {
float result;
if (NS_FAILED(GetFloat(aID, &result))) {
return aDefault;
}
return result;
}
/**
* Retrieve the name and style of a system-theme font. Returns true
* if the system theme specifies this font, false if a default should
* be used. In the latter case neither aName nor aStyle is modified.
*
* Size of the font should be in CSS pixels, not device pixels.
*
* @param aID Which system-theme font is wanted.
* @param aName The name of the font to use.
* @param aStyle Styling to apply to the font.
*/
static bool GetFont(FontID aID, nsString& aName, gfxFontStyle& aStyle);
/**
* GetPasswordCharacter() returns a unicode character which should be used
* for a masked character in password editor. E.g., '*'.
*/
static char16_t GetPasswordCharacter();
/**
* If the latest character in password field shouldn't be hidden by the
* result of GetPasswordCharacter(), GetEchoPassword() returns TRUE.
* Otherwise, FALSE.
*/
static bool GetEchoPassword();
/**
* Whether we should be drawing in the titlebar by default.
*/
static bool DrawInTitlebar();
/**
* The millisecond to mask password value.
* This value is only valid when GetEchoPassword() returns true.
*/
static uint32_t GetPasswordMaskDelay();
/** Gets theme information for about:support */
static void GetThemeInfo(nsACString&);
/**
* When system look and feel is changed, Refresh() must be called. Then,
* cached data would be released.
*/
static void Refresh();
/**
* GTK's initialization code can't be run off main thread, call this
* if you plan on using LookAndFeel off main thread later.
*
* This initialized state may get reset due to theme changes, so it
* must be called prior to each potential off-main-thread LookAndFeel
* call, not just once.
*/
static void NativeInit();
static void SetData(widget::FullLookAndFeel&& aTables);
static void NotifyChangedAllWindows(widget::ThemeChangeKind);
static bool HasPendingGlobalThemeChange() { return sGlobalThemeChanged; }
static void HandleGlobalThemeChange() {
if (MOZ_UNLIKELY(HasPendingGlobalThemeChange())) {
DoHandleGlobalThemeChange();
}
}
static void EnsureColorSchemesInitialized() {
if (!sColorSchemeInitialized) {
RecomputeColorSchemes();
}
MOZ_ASSERT(sColorSchemeInitialized);
}
static ColorScheme sChromeColorScheme;
static ColorScheme sContentColorScheme;
protected:
static void RecomputeColorSchemes();
static bool sColorSchemeInitialized;
static void DoHandleGlobalThemeChange();
// Set to true when ThemeChanged needs to be called on mTheme (and other
// global LookAndFeel. This is used because mTheme is a service, so there's
// no need to notify it from more than one prescontext.
static bool sGlobalThemeChanged;
};
} // namespace mozilla
// ---------------------------------------------------------------------
// Special colors for ColorID::IME* and ColorID::SpellCheckerUnderline
// ---------------------------------------------------------------------
// For background color only.
constexpr nscolor NS_TRANSPARENT = NS_RGBA(0x01, 0x00, 0x00, 0x00);
// For foreground color only.
constexpr nscolor NS_SAME_AS_FOREGROUND_COLOR = NS_RGBA(0x02, 0x00, 0x00, 0x00);
constexpr nscolor NS_40PERCENT_FOREGROUND_COLOR =
NS_RGBA(0x03, 0x00, 0x00, 0x00);
#define NS_IS_SELECTION_SPECIAL_COLOR(c) \
((c) == NS_TRANSPARENT || (c) == NS_SAME_AS_FOREGROUND_COLOR || \
(c) == NS_40PERCENT_FOREGROUND_COLOR)
// ------------------------------------------
// Bits for IntID::AlertNotificationOrigin
// ------------------------------------------
#define NS_ALERT_HORIZONTAL 1
#define NS_ALERT_LEFT 2
#define NS_ALERT_TOP 4
#endif /* __LookAndFeel */
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