1 files changed, 119 insertions, 0 deletions
diff --git a/widget/gtk/nsNativeThemeGTK.h b/widget/gtk/nsNativeThemeGTK.h
new file mode 100644
index 0000000000..2d0878290e
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+++ b/widget/gtk/nsNativeThemeGTK.h
@@ -0,0 +1,119 @@
+/* -*- 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 _GTK_NSNATIVETHEMEGTK_H_
+#define _GTK_NSNATIVETHEMEGTK_H_
+
+#include "nsITheme.h"
+#include "nsCOMPtr.h"
+#include "nsAtom.h"
+#include "Theme.h"
+
+#include <gtk/gtk.h>
+#include "gtkdrawing.h"
+
+class nsNativeThemeGTK final : public mozilla::widget::Theme {
+  using Theme = mozilla::widget::Theme;
+
+ public:
+  // The nsITheme interface.
+  NS_IMETHOD DrawWidgetBackground(gfxContext* aContext, nsIFrame* aFrame,
+                                  StyleAppearance aAppearance,
+                                  const nsRect& aRect, const nsRect& aDirtyRect,
+                                  DrawOverflow) override;
+
+  bool CreateWebRenderCommandsForWidget(
+      mozilla::wr::DisplayListBuilder& aBuilder,
+      mozilla::wr::IpcResourceUpdateQueue& aResources,
+      const mozilla::layers::StackingContextHelper& aSc,
+      mozilla::layers::RenderRootStateManager* aManager, nsIFrame*,
+      StyleAppearance, const nsRect& aRect) override;
+
+  [[nodiscard]] LayoutDeviceIntMargin GetWidgetBorder(
+      nsDeviceContext* aContext, nsIFrame* aFrame,
+      StyleAppearance aAppearance) override;
+
+  bool GetWidgetPadding(nsDeviceContext* aContext, nsIFrame* aFrame,
+                        StyleAppearance aAppearance,
+                        LayoutDeviceIntMargin* aResult) override;
+
+  bool GetWidgetOverflow(nsDeviceContext* aContext, nsIFrame* aFrame,
+                         StyleAppearance aAppearance,
+                         nsRect* aOverflowRect) override;
+
+  // Whether we draw a non-native widget.
+  //
+  // We always draw scrollbars as non-native so that all of Firefox has
+  // consistent scrollbar styles both in chrome and content (plus, the
+  // non-native scrollbars support scrollbar-width, auto-darkening...).
+  //
+  // We draw other widgets as non-native when their color-scheme doesn't match
+  // the current GTK theme's color-scheme. We do that because frequently
+  // switching GTK themes at runtime is prohibitively expensive. In that case
+  // (`BecauseColorMismatch`) we don't call into the non-native theme for sizing
+  // information (GetWidgetPadding/Border and GetMinimumWidgetSize), to avoid
+  // subtle sizing changes. The non-native theme can basically draw at any size,
+  // so we prefer to have consistent sizing information.
+  enum class NonNative { No, Always, BecauseColorMismatch };
+  static bool IsWidgetAlwaysNonNative(nsIFrame*, StyleAppearance);
+  NonNative IsWidgetNonNative(nsIFrame*, StyleAppearance);
+
+  mozilla::LayoutDeviceIntSize GetMinimumWidgetSize(
+      nsPresContext* aPresContext, nsIFrame* aFrame,
+      StyleAppearance aAppearance) override;
+
+  NS_IMETHOD WidgetStateChanged(nsIFrame* aFrame, StyleAppearance aAppearance,
+                                nsAtom* aAttribute, bool* aShouldRepaint,
+                                const nsAttrValue* aOldValue) override;
+
+  NS_IMETHOD ThemeChanged() override;
+
+  NS_IMETHOD_(bool)
+  ThemeSupportsWidget(nsPresContext* aPresContext, nsIFrame* aFrame,
+                      StyleAppearance aAppearance) override;
+
+  NS_IMETHOD_(bool) WidgetIsContainer(StyleAppearance aAppearance) override;
+
+  bool ThemeDrawsFocusForWidget(nsIFrame*, StyleAppearance) override;
+
+  bool ThemeNeedsComboboxDropmarker() override;
+  Transparency GetWidgetTransparency(nsIFrame*, StyleAppearance) override;
+
+  nsNativeThemeGTK();
+
+ protected:
+  virtual ~nsNativeThemeGTK();
+
+ private:
+  GtkTextDirection GetTextDirection(nsIFrame* aFrame);
+  gint GetTabMarginPixels(nsIFrame* aFrame);
+  bool GetGtkWidgetAndState(StyleAppearance aAppearance, nsIFrame* aFrame,
+                            WidgetNodeType& aGtkWidgetType,
+                            GtkWidgetState* aState, gint* aWidgetFlags);
+  mozilla::CSSIntMargin GetExtraSizeForWidget(nsIFrame*, StyleAppearance);
+  bool IsWidgetVisible(StyleAppearance aAppearance);
+
+  void RefreshWidgetWindow(nsIFrame* aFrame);
+  WidgetNodeType NativeThemeToGtkTheme(StyleAppearance aAppearance,
+                                       nsIFrame* aFrame);
+
+  uint8_t mDisabledWidgetTypes
+      [(static_cast<size_t>(mozilla::StyleAppearance::Count) + 7) / 8];
+  uint8_t
+      mSafeWidgetStates[static_cast<size_t>(mozilla::StyleAppearance::Count) *
+                        4];  // 32 bits per widget
+  static const char* sDisabledEngines[];
+
+  // Because moz_gtk_get_widget_border can be slow, we cache its results
+  // by widget type.  Each bit in mBorderCacheValid says whether the
+  // corresponding entry in mBorderCache is valid.
+  mozilla::CSSIntMargin GetCachedWidgetBorder(nsIFrame* aFrame,
+                                              StyleAppearance aAppearance,
+                                              GtkTextDirection aDirection);
+  uint8_t mBorderCacheValid[(MOZ_GTK_WIDGET_NODE_COUNT + 7) / 8];
+  mozilla::CSSIntMargin mBorderCache[MOZ_GTK_WIDGET_NODE_COUNT];
+};
+
+#endif