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// Copyright 2016 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef THIRD_PARTY_BLINK_RENDERER_CORE_FRAME_BROWSER_CONTROLS_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_FRAME_BROWSER_CONTROLS_H_
#include "cc/input/browser_controls_state.h"
#include "cc/trees/browser_controls_params.h"
#include "third_party/blink/renderer/core/core_export.h"
#include "third_party/blink/renderer/platform/heap/garbage_collected.h"
#include "third_party/blink/renderer/platform/heap/member.h"
namespace blink {
class Page;
// This class encapsulate data and logic required to show/hide browser controls
// duplicating cc::BrowserControlsOffsetManager behaviour. Browser controls'
// self-animation to completion is still handled by compositor and kicks in
// when scrolling is complete (i.e, upon ScrollEnd or FlingEnd). Browser
// controls can exist at the top or bottom of the screen and potentially at the
// same time. Bottom controls differ from top in that, if they exist alone,
// never translate the content down and scroll immediately, regardless of the
// controls' offset.
class CORE_EXPORT BrowserControls final
: public GarbageCollected<BrowserControls> {
public:
explicit BrowserControls(Page&);
void Trace(Visitor*) const;
// The height the top controls are hidden; used for viewport adjustments
// while the controls are resizing.
float UnreportedSizeAdjustment();
// The amount that browser controls are currently shown.
float ContentOffset();
float BottomContentOffset();
float TopHeight() const { return params_.top_controls_height; }
float TopMinHeight() const { return params_.top_controls_min_height; }
float BottomHeight() const { return params_.bottom_controls_height; }
float BottomMinHeight() const { return params_.bottom_controls_min_height; }
float TotalHeight() const { return TopHeight() + BottomHeight(); }
float TotalMinHeight() const { return TopMinHeight() + BottomMinHeight(); }
bool ShrinkViewport() const {
return params_.browser_controls_shrink_blink_size;
}
bool AnimateHeightChanges() const {
return params_.animate_browser_controls_height_changes;
}
void SetParams(cc::BrowserControlsParams);
cc::BrowserControlsParams Params() const { return params_; }
float TopShownRatio() const { return top_shown_ratio_; }
float BottomShownRatio() const { return bottom_shown_ratio_; }
void SetShownRatio(float top_ratio, float bottom_ratio);
void UpdateConstraintsAndState(cc::BrowserControlsState constraints,
cc::BrowserControlsState current);
cc::BrowserControlsState PermittedState() const { return permitted_state_; }
private:
void DidUpdateBrowserControls(bool update_safe_area_inset);
void ResetBaseline();
float TopMinShownRatio();
float BottomMinShownRatio();
Member<Page> page_;
// The browser controls params such as heights, min-height etc.
cc::BrowserControlsParams params_;
// The browser controls shown amount (normalized from 0 to 1) since the last
// compositor commit. This value is updated from two sources:
// (1) compositor (impl) thread at the beginning of frame if it has
// scrolled browser controls since last commit.
// (2) blink (main) thread updates this value if it scrolls browser controls
// when responding to gesture scroll events.
// This value is reflected in web layer tree and is synced with compositor
// during the commit.
float top_shown_ratio_;
float bottom_shown_ratio_;
// Content offset when last re-baseline occurred.
float baseline_top_content_offset_;
float baseline_bottom_content_offset_;
// Accumulated scroll delta since last re-baseline.
float accumulated_scroll_delta_;
// Constraints on the browser controls state
cc::BrowserControlsState permitted_state_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_CORE_FRAME_BROWSER_CONTROLS_H_
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