widget/gtk/nsNativeThemeGTK.h

   1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this
   4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   5
   6 #ifndef _GTK_NSNATIVETHEMEGTK_H_
   7 #define _GTK_NSNATIVETHEMEGTK_H_
   8
   9 #include "nsITheme.h"
  10 #include "nsCOMPtr.h"
  11 #include "nsAtom.h"
  12 #include "Theme.h"
  13
  14 #include <gtk/gtk.h>
  15 #include "gtkdrawing.h"
  16
  17 class nsNativeThemeGTK final : public mozilla::widget::Theme {
  18   using Theme = mozilla::widget::Theme;
  19
  20  public:
  21   // The nsITheme interface.
  22   NS_IMETHOD DrawWidgetBackground(gfxContext* aContext, nsIFrame* aFrame,
  23                                   StyleAppearance aAppearance,
  24                                   const nsRect& aRect, const nsRect& aDirtyRect,
  25                                   DrawOverflow) override;
  26
  27   bool CreateWebRenderCommandsForWidget(
  28       mozilla::wr::DisplayListBuilder& aBuilder,
  29       mozilla::wr::IpcResourceUpdateQueue& aResources,
  30       const mozilla::layers::StackingContextHelper& aSc,
  31       mozilla::layers::RenderRootStateManager* aManager, nsIFrame*,
  32       StyleAppearance, const nsRect& aRect) override;
  33
  34   [[nodiscard]] LayoutDeviceIntMargin GetWidgetBorder(
  35       nsDeviceContext* aContext, nsIFrame* aFrame,
  36       StyleAppearance aAppearance) override;
  37
  38   bool GetWidgetPadding(nsDeviceContext* aContext, nsIFrame* aFrame,
  39                         StyleAppearance aAppearance,
  40                         LayoutDeviceIntMargin* aResult) override;
  41
  42   bool GetWidgetOverflow(nsDeviceContext* aContext, nsIFrame* aFrame,
  43                          StyleAppearance aAppearance,
  44                          nsRect* aOverflowRect) override;
  45
  46   // Whether we draw a non-native widget.
  47   //
  48   // We always draw scrollbars as non-native so that all of Firefox has
  49   // consistent scrollbar styles both in chrome and content (plus, the
  50   // non-native scrollbars support scrollbar-width, auto-darkening...).
  51   //
  52   // We draw other widgets as non-native when their color-scheme doesn't match
  53   // the current GTK theme's color-scheme. We do that because frequently
  54   // switching GTK themes at runtime is prohibitively expensive. In that case
  55   // (`BecauseColorMismatch`) we don't call into the non-native theme for sizing
  56   // information (GetWidgetPadding/Border and GetMinimumWidgetSize), to avoid
  57   // subtle sizing changes. The non-native theme can basically draw at any size,
  58   // so we prefer to have consistent sizing information.
  59   enum class NonNative { No, Always, BecauseColorMismatch };
  60   NonNative IsWidgetNonNative(nsIFrame*, StyleAppearance);
  61
  62   NS_IMETHOD GetMinimumWidgetSize(nsPresContext* aPresContext, nsIFrame* aFrame,
  63                                   StyleAppearance aAppearance,
  64                                   mozilla::LayoutDeviceIntSize* aResult,
  65                                   bool* aIsOverridable) override;
  66
  67   NS_IMETHOD WidgetStateChanged(nsIFrame* aFrame, StyleAppearance aAppearance,
  68                                 nsAtom* aAttribute, bool* aShouldRepaint,
  69                                 const nsAttrValue* aOldValue) override;
  70
  71   NS_IMETHOD ThemeChanged() override;
  72
  73   NS_IMETHOD_(bool)
  74   ThemeSupportsWidget(nsPresContext* aPresContext, nsIFrame* aFrame,
  75                       StyleAppearance aAppearance) override;
  76
  77   NS_IMETHOD_(bool) WidgetIsContainer(StyleAppearance aAppearance) override;
  78
  79   bool ThemeDrawsFocusForWidget(nsIFrame*, StyleAppearance) override;
  80
  81   bool ThemeNeedsComboboxDropmarker() override;
  82   Transparency GetWidgetTransparency(nsIFrame*, StyleAppearance) override;
  83
  84   nsNativeThemeGTK();
  85
  86  protected:
  87   virtual ~nsNativeThemeGTK();
  88
  89  private:
  90   GtkTextDirection GetTextDirection(nsIFrame* aFrame);
  91   gint GetTabMarginPixels(nsIFrame* aFrame);
  92   bool GetGtkWidgetAndState(StyleAppearance aAppearance, nsIFrame* aFrame,
  93                             WidgetNodeType& aGtkWidgetType,
  94                             GtkWidgetState* aState, gint* aWidgetFlags);
  95   bool GetExtraSizeForWidget(nsIFrame* aFrame, StyleAppearance aAppearance,
  96                              nsIntMargin* aExtra);
  97   bool IsWidgetVisible(StyleAppearance aAppearance);
  98
  99   void RefreshWidgetWindow(nsIFrame* aFrame);
 100   WidgetNodeType NativeThemeToGtkTheme(StyleAppearance aAppearance,
 101                                        nsIFrame* aFrame);
 102
 103   uint8_t mDisabledWidgetTypes
 104       [(static_cast<size_t>(mozilla::StyleAppearance::Count) + 7) / 8];
 105   uint8_t
 106       mSafeWidgetStates[static_cast<size_t>(mozilla::StyleAppearance::Count) *
 107                         4];  // 32 bits per widget
 108   static const char* sDisabledEngines[];
 109
 110   // Because moz_gtk_get_widget_border can be slow, we cache its results
 111   // by widget type.  Each bit in mBorderCacheValid says whether the
 112   // corresponding entry in mBorderCache is valid.
 113   void GetCachedWidgetBorder(nsIFrame* aFrame, StyleAppearance aAppearance,
 114                              GtkTextDirection aDirection,
 115                              LayoutDeviceIntMargin* aResult);
 116   uint8_t mBorderCacheValid[(MOZ_GTK_WIDGET_NODE_COUNT + 7) / 8];
 117   LayoutDeviceIntMargin mBorderCache[MOZ_GTK_WIDGET_NODE_COUNT];
 118 };
 119
 120 #endif