blob: 88e76fa113d030ac93fc91f0b68efef049854223 [file] [log] [blame]
// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <memory>
#include "base/macros.h"
#include "base/memory/weak_ptr.h"
#include "base/time/time.h"
#include "cc/input/browser_controls_state.h"
#include "cc/layers/layer_impl.h"
#include "ui/gfx/geometry/size.h"
#include "ui/gfx/geometry/vector2d_f.h"
namespace cc {
class BrowserControlsOffsetManagerClient;
// Manages the position of the browser controls.
class CC_EXPORT BrowserControlsOffsetManager
: public base::SupportsWeakPtr<BrowserControlsOffsetManager> {
static std::unique_ptr<BrowserControlsOffsetManager> Create(
BrowserControlsOffsetManagerClient* client,
float controls_show_threshold,
float controls_hide_threshold);
virtual ~BrowserControlsOffsetManager();
// The offset from the window top to the top edge of the controls. Runs from 0
// (controls fully shown) to negative values (down is positive).
float ControlsTopOffset() const;
// The amount of offset of the web content area. Same as the current shown
// height of the browser controls.
float ContentTopOffset() const;
float TopControlsShownRatio() const;
float TopControlsHeight() const;
// The amount of offset of the web content area, calculating from the bottom.
// Same as the current shown height of the bottom controls.
float ContentBottomOffset() const;
// Similar to TopControlsHeight(), this method should return a static value.
// The current animated height should be acquired from ContentBottomOffset().
float BottomControlsHeight() const;
float BottomControlsShownRatio() const;
bool has_animation() const { return animation_direction_ != NO_ANIMATION; }
AnimationDirection animation_direction() { return animation_direction_; }
void UpdateBrowserControlsState(BrowserControlsState constraints,
BrowserControlsState current,
bool animate);
void ScrollBegin();
gfx::Vector2dF ScrollBy(const gfx::Vector2dF& pending_delta);
void ScrollEnd();
// The caller should ensure that |Pinch{Begin,End}| are called within
// the scope of |Scroll{Begin,End}|.
void PinchBegin();
void PinchEnd();
void MainThreadHasStoppedFlinging();
gfx::Vector2dF Animate(base::TimeTicks monotonic_time);
BrowserControlsOffsetManager(BrowserControlsOffsetManagerClient* client,
float controls_show_threshold,
float controls_hide_threshold);
void ResetAnimations();
void SetupAnimation(AnimationDirection direction);
void StartAnimationIfNecessary();
bool IsAnimationComplete(float new_ratio);
void ResetBaseline();
// The client manages the lifecycle of this.
BrowserControlsOffsetManagerClient* client_;
base::TimeTicks animation_start_time_;
float animation_start_value_;
base::TimeTicks animation_stop_time_;
float animation_stop_value_;
AnimationDirection animation_direction_;
BrowserControlsState permitted_state_;
// Accumulated scroll delta since last baseline reset
float accumulated_scroll_delta_;
// Content offset when last baseline reset occurred.
float baseline_top_content_offset_;
float baseline_bottom_content_offset_;
// The percent height of the visible control such that it must be shown
// when the user stops the scroll.
float controls_show_threshold_;
// The percent height of the visible control such that it must be hidden
// when the user stops the scroll.
float controls_hide_threshold_;
bool pinch_gesture_active_;
} // namespace cc