1 files changed, 150 insertions, 0 deletions
diff --git a/gfx/layers/apz/public/IAPZCTreeManager.h b/gfx/layers/apz/public/IAPZCTreeManager.h
new file mode 100644
index 0000000000..7d31902bb8
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+++ b/gfx/layers/apz/public/IAPZCTreeManager.h
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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 http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_layers_IAPZCTreeManager_h
+#define mozilla_layers_IAPZCTreeManager_h
+
+#include <stdint.h>  // for uint64_t, uint32_t
+
+#include "mozilla/layers/LayersTypes.h"          // for TouchBehaviorFlags
+#include "mozilla/layers/ScrollableLayerGuid.h"  // for ScrollableLayerGuid, etc
+#include "mozilla/layers/ZoomConstraints.h"      // for ZoomConstraints
+#include "nsTArrayForwardDeclare.h"  // for nsTArray, nsTArray_Impl, etc
+#include "nsISupportsImpl.h"         // for MOZ_COUNT_CTOR, etc
+#include "Units.h"                   // for CSSRect, etc
+
+namespace mozilla {
+namespace layers {
+
+class APZInputBridge;
+class KeyboardMap;
+struct ZoomTarget;
+
+enum AllowedTouchBehavior {
+  NONE = 0,
+  VERTICAL_PAN = 1 << 0,
+  HORIZONTAL_PAN = 1 << 1,
+  PINCH_ZOOM = 1 << 2,
+  DOUBLE_TAP_ZOOM = 1 << 3,
+  UNKNOWN = 1 << 4
+};
+
+enum ZoomToRectBehavior : uint32_t {
+  DEFAULT_BEHAVIOR = 0,
+  DISABLE_ZOOM_OUT = 1 << 0,
+  PAN_INTO_VIEW_ONLY = 1 << 1,
+  ONLY_ZOOM_TO_DEFAULT_SCALE = 1 << 2,
+};
+
+enum class BrowserGestureResponse : bool;
+
+class AsyncDragMetrics;
+struct APZHandledResult;
+
+class IAPZCTreeManager {
+  NS_INLINE_DECL_THREADSAFE_VIRTUAL_REFCOUNTING(IAPZCTreeManager)
+
+ public:
+  /**
+   * Set the keyboard shortcuts to use for translating keyboard events.
+   */
+  virtual void SetKeyboardMap(const KeyboardMap& aKeyboardMap) = 0;
+
+  /**
+   * Kicks an animation to zoom to a rect. This may be either a zoom out or zoom
+   * in. The actual animation is done on the sampler thread after being set
+   * up. |aRect| must be given in CSS pixels, relative to the document.
+   * |aFlags| is a combination of the ZoomToRectBehavior enum values.
+   */
+  virtual void ZoomToRect(const ScrollableLayerGuid& aGuid,
+                          const ZoomTarget& aZoomTarget,
+                          const uint32_t aFlags = DEFAULT_BEHAVIOR) = 0;
+
+  /**
+   * If we have touch listeners, this should always be called when we know
+   * definitively whether or not content has preventDefaulted any touch events
+   * that have come in. If |aPreventDefault| is true, any touch events in the
+   * queue will be discarded. This function must be called on the controller
+   * thread.
+   */
+  virtual void ContentReceivedInputBlock(uint64_t aInputBlockId,
+                                         bool aPreventDefault) = 0;
+
+  /**
+   * When the event regions code is enabled, this function should be invoked to
+   * to confirm the target of the input block. This is only needed in cases
+   * where the initial input event of the block hit a dispatch-to-content region
+   * but is safe to call for all input blocks. This function should always be
+   * invoked on the controller thread.
+   * The different elements in the array of targets correspond to the targets
+   * for the different touch points. In the case where the touch point has no
+   * target, or the target is not a scrollable frame, the target's |mScrollId|
+   * should be set to ScrollableLayerGuid::NULL_SCROLL_ID.
+   */
+  virtual void SetTargetAPZC(uint64_t aInputBlockId,
+                             const nsTArray<ScrollableLayerGuid>& aTargets) = 0;
+
+  /**
+   * Updates any zoom constraints contained in the <meta name="viewport"> tag.
+   * If the |aConstraints| is Nothing() then previously-provided constraints for
+   * the given |aGuid| are cleared.
+   */
+  virtual void UpdateZoomConstraints(
+      const ScrollableLayerGuid& aGuid,
+      const Maybe<ZoomConstraints>& aConstraints) = 0;
+
+  virtual void SetDPI(float aDpiValue) = 0;
+
+  /**
+   * Sets allowed touch behavior values for current touch-session for specific
+   * input block (determined by aInputBlock).
+   * Should be invoked by the widget. Each value of the aValues arrays
+   * corresponds to the different touch point that is currently active.
+   * Must be called after receiving the TOUCH_START event that starts the
+   * touch-session.
+   * This must be called on the controller thread.
+   */
+  virtual void SetAllowedTouchBehavior(
+      uint64_t aInputBlockId, const nsTArray<TouchBehaviorFlags>& aValues) = 0;
+
+  virtual void SetBrowserGestureResponse(uint64_t aInputBlockId,
+                                         BrowserGestureResponse aResponse) = 0;
+
+  virtual void StartScrollbarDrag(const ScrollableLayerGuid& aGuid,
+                                  const AsyncDragMetrics& aDragMetrics) = 0;
+
+  virtual bool StartAutoscroll(const ScrollableLayerGuid& aGuid,
+                               const ScreenPoint& aAnchorLocation) = 0;
+
+  virtual void StopAutoscroll(const ScrollableLayerGuid& aGuid) = 0;
+
+  /**
+   * Function used to disable LongTap gestures.
+   *
+   * On slow running tests, drags and touch events can be misinterpreted
+   * as a long tap. This allows tests to disable long tap gesture detection.
+   */
+  virtual void SetLongTapEnabled(bool aTapGestureEnabled) = 0;
+
+  /**
+   * Returns an APZInputBridge interface that can be used to send input
+   * events to APZ in a synchronous manner. This will always be non-null, and
+   * the returned object's lifetime will match the lifetime of this
+   * IAPZCTreeManager implementation.
+   * It is only valid to call this function in the UI process.
+   */
+  virtual APZInputBridge* InputBridge() = 0;
+
+ protected:
+  // Discourage destruction outside of decref
+
+  virtual ~IAPZCTreeManager() = default;
+};
+
+}  // namespace layers
+}  // namespace mozilla
+
+#endif  // mozilla_layers_IAPZCTreeManager_h