1 files changed, 181 insertions, 0 deletions
diff --git a/widget/headless/HeadlessWidget.h b/widget/headless/HeadlessWidget.h
new file mode 100644
index 0000000000..f5b1088686
--- /dev/null
+++ b/widget/headless/HeadlessWidget.h
@@ -0,0 +1,181 @@
+/* -*- 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 HEADLESSWIDGET_H
+#define HEADLESSWIDGET_H
+
+#include "mozilla/widget/InProcessCompositorWidget.h"
+#include "nsBaseWidget.h"
+#include "CompositorWidget.h"
+#include "mozilla/dom/WheelEventBinding.h"
+
+// The various synthesized event values are hardcoded to avoid pulling
+// in the platform specific widget code.
+#if defined(MOZ_WIDGET_GTK)
+#  define MOZ_HEADLESS_SCROLL_MULTIPLIER 3
+#  define MOZ_HEADLESS_SCROLL_DELTA_MODE \
+    mozilla::dom::WheelEvent_Binding::DOM_DELTA_LINE
+#elif defined(XP_WIN)
+#  define MOZ_HEADLESS_SCROLL_MULTIPLIER \
+    .025  // default scroll lines (3) / WHEEL_DELTA (120)
+#  define MOZ_HEADLESS_SCROLL_DELTA_MODE \
+    mozilla::dom::WheelEvent_Binding::DOM_DELTA_LINE
+#elif defined(XP_MACOSX)
+#  define MOZ_HEADLESS_SCROLL_MULTIPLIER 1
+#  define MOZ_HEADLESS_SCROLL_DELTA_MODE \
+    mozilla::dom::WheelEvent_Binding::DOM_DELTA_PIXEL
+#elif defined(ANDROID)
+#  define MOZ_HEADLESS_SCROLL_MULTIPLIER 1
+#  define MOZ_HEADLESS_SCROLL_DELTA_MODE \
+    mozilla::dom::WheelEvent_Binding::DOM_DELTA_LINE
+#else
+#  define MOZ_HEADLESS_SCROLL_MULTIPLIER -1
+#  define MOZ_HEADLESS_SCROLL_DELTA_MODE -1
+#endif
+
+namespace mozilla {
+enum class NativeKeyBindingsType : uint8_t;
+namespace widget {
+
+class HeadlessWidget : public nsBaseWidget {
+ public:
+  HeadlessWidget();
+
+  NS_INLINE_DECL_REFCOUNTING_INHERITED(HeadlessWidget, nsBaseWidget)
+
+  void* GetNativeData(uint32_t aDataType) override {
+    // Headless widgets have no native data.
+    return nullptr;
+  }
+
+  virtual nsresult Create(nsIWidget* aParent, nsNativeWidget aNativeParent,
+                          const LayoutDeviceIntRect& aRect,
+                          nsWidgetInitData* aInitData = nullptr) override;
+  using nsBaseWidget::Create;  // for Create signature not overridden here
+  virtual already_AddRefed<nsIWidget> CreateChild(
+      const LayoutDeviceIntRect& aRect, nsWidgetInitData* aInitData = nullptr,
+      bool aForceUseIWidgetParent = false) override;
+
+  virtual nsIWidget* GetTopLevelWidget() override;
+
+  virtual void GetCompositorWidgetInitData(
+      mozilla::widget::CompositorWidgetInitData* aInitData) override;
+
+  virtual void Destroy() override;
+  virtual void Show(bool aState) override;
+  virtual bool IsVisible() const override;
+  virtual void Move(double aX, double aY) override;
+  virtual void Resize(double aWidth, double aHeight, bool aRepaint) override;
+  virtual void Resize(double aX, double aY, double aWidth, double aHeight,
+                      bool aRepaint) override;
+  virtual nsSizeMode SizeMode() override { return mSizeMode; }
+  virtual void SetSizeMode(nsSizeMode aMode) override;
+  virtual nsresult MakeFullScreen(bool aFullScreen) override;
+  virtual void Enable(bool aState) override;
+  virtual bool IsEnabled() const override;
+  virtual void SetFocus(Raise, mozilla::dom::CallerType aCallerType) override;
+  virtual void Invalidate(const LayoutDeviceIntRect& aRect) override {
+    // TODO: see if we need to do anything here.
+  }
+  virtual nsresult SetTitle(const nsAString& title) override {
+    // Headless widgets have no title, so just ignore it.
+    return NS_OK;
+  }
+  virtual nsresult SetNonClientMargins(
+      LayoutDeviceIntMargin& margins) override {
+    // Headless widgets have no chrome margins, so just ignore the call.
+    return NS_OK;
+  }
+  virtual LayoutDeviceIntPoint WidgetToScreenOffset() override;
+  virtual void SetInputContext(const InputContext& aContext,
+                               const InputContextAction& aAction) override {
+    mInputContext = aContext;
+  }
+  virtual InputContext GetInputContext() override { return mInputContext; }
+
+  virtual WindowRenderer* GetWindowRenderer() override;
+
+  void SetCompositorWidgetDelegate(CompositorWidgetDelegate* delegate) override;
+
+  [[nodiscard]] virtual nsresult AttachNativeKeyEvent(
+      WidgetKeyboardEvent& aEvent) override;
+  MOZ_CAN_RUN_SCRIPT virtual bool GetEditCommands(
+      NativeKeyBindingsType aType, const WidgetKeyboardEvent& aEvent,
+      nsTArray<CommandInt>& aCommands) override;
+
+  virtual nsresult DispatchEvent(WidgetGUIEvent* aEvent,
+                                 nsEventStatus& aStatus) override;
+
+  virtual nsresult SynthesizeNativeMouseEvent(
+      LayoutDeviceIntPoint aPoint, NativeMouseMessage aNativeMessage,
+      mozilla::MouseButton aButton, nsIWidget::Modifiers aModifierFlags,
+      nsIObserver* aObserver) override;
+  virtual nsresult SynthesizeNativeMouseMove(LayoutDeviceIntPoint aPoint,
+                                             nsIObserver* aObserver) override {
+    return SynthesizeNativeMouseEvent(
+        aPoint, NativeMouseMessage::Move, mozilla::MouseButton::eNotPressed,
+        nsIWidget::Modifiers::NO_MODIFIERS, aObserver);
+  };
+
+  virtual nsresult SynthesizeNativeMouseScrollEvent(
+      LayoutDeviceIntPoint aPoint, uint32_t aNativeMessage, double aDeltaX,
+      double aDeltaY, double aDeltaZ, uint32_t aModifierFlags,
+      uint32_t aAdditionalFlags, nsIObserver* aObserver) override;
+
+  virtual nsresult SynthesizeNativeTouchPoint(uint32_t aPointerId,
+                                              TouchPointerState aPointerState,
+                                              LayoutDeviceIntPoint aPoint,
+                                              double aPointerPressure,
+                                              uint32_t aPointerOrientation,
+                                              nsIObserver* aObserver) override;
+
+  virtual nsresult SynthesizeNativeTouchPadPinch(
+      TouchpadGesturePhase aEventPhase, float aScale,
+      LayoutDeviceIntPoint aPoint, int32_t aModifierFlags) override;
+
+  virtual nsresult SynthesizeNativeTouchpadPan(TouchpadGesturePhase aEventPhase,
+                                               LayoutDeviceIntPoint aPoint,
+                                               double aDeltaX, double aDeltaY,
+                                               int32_t aModifierFlags,
+                                               nsIObserver* aObserver) override;
+
+ private:
+  ~HeadlessWidget();
+  bool mEnabled;
+  bool mVisible;
+  bool mDestroyed;
+  nsIWidget* mTopLevel;
+  HeadlessCompositorWidget* mCompositorWidget;
+  nsSizeMode mSizeMode;
+  // The size mode before entering fullscreen mode.
+  nsSizeMode mLastSizeMode;
+  // The last size mode set while the window was visible.
+  nsSizeMode mEffectiveSizeMode;
+  mozilla::ScreenCoord mLastPinchSpan;
+  InputContext mInputContext;
+  mozilla::UniquePtr<mozilla::MultiTouchInput> mSynthesizedTouchInput;
+  // In headless there is no window manager to track window bounds
+  // across size mode changes, so we must track it to emulate.
+  LayoutDeviceIntRect mRestoreBounds;
+  void ApplySizeModeSideEffects();
+  // Move while maintaining size mode.
+  void MoveInternal(int32_t aX, int32_t aY);
+  // Resize while maintaining size mode.
+  void ResizeInternal(int32_t aWidth, int32_t aHeight, bool aRepaint);
+  // Similarly, we must track the active window ourselves in order
+  // to dispatch (de)activation events properly.
+  void RaiseWindow();
+  // The top level widgets are tracked for window ordering. They are
+  // stored in order of activation where the last element is always the
+  // currently active widget.
+  static StaticAutoPtr<nsTArray<HeadlessWidget*>> sActiveWindows;
+  // Get the most recently activated widget or null if there are none.
+  static already_AddRefed<HeadlessWidget> GetActiveWindow();
+};
+
+}  // namespace widget
+}  // namespace mozilla
+
+#endif