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// Copyright 2013 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.
#ifndef CC_PINCH_ZOOM_VIEWPORT_H_
#define CC_PINCH_ZOOM_VIEWPORT_H_
#include "cc/cc_export.h"
#include "ui/gfx/rect.h"
#include "ui/gfx/transform.h"
namespace cc {
// PinchZoomViewport models the bounds and offset of the viewport that is used
// during a pinch-zoom operation. It tracks the layout-space dimensions of the
// viewport before any applied scale, and then tracks the layout-space
// coordinates of the viewport respecting the pinch settings.
class CC_EXPORT PinchZoomViewport {
public:
PinchZoomViewport();
float total_page_scale_factor() const {
return page_scale_factor_ * page_scale_delta_;
}
void set_page_scale_factor(float factor) { page_scale_factor_ = factor; }
float page_scale_factor() const { return page_scale_factor_; }
void set_page_scale_delta(float delta);
float page_scale_delta() const { return page_scale_delta_; }
float min_page_scale_factor() const { return min_page_scale_factor_; }
float max_page_scale_factor() const { return max_page_scale_factor_; }
void set_sent_page_scale_delta(float delta) {
sent_page_scale_delta_ = delta;
}
float sent_page_scale_delta() const { return sent_page_scale_delta_; }
void set_device_scale_factor(float factor) { device_scale_factor_ = factor; }
float device_scale_factor() const { return device_scale_factor_; }
// Returns true if the passed parameters were different from those previously
// cached.
bool SetPageScaleFactorAndLimits(float page_scale_factor,
float min_page_scale_factor,
float max_page_scale_factor);
// Returns the zoomed viewport in layout space. The rect's position is an
// offset from the root layer's scroll position (therefore, zero if fully
// zoomed out).
gfx::RectF ZoomedViewport() const;
const gfx::Vector2dF& zoomed_viewport_offset() const {
return zoomed_viewport_offset_;
}
void set_layout_viewport_size(const gfx::SizeF& size) {
layout_viewport_size_ = size;
}
// We need to store device_viewport_size separately because in mobile
// fixed-layout mode, there is not necessarily a simple mapping between layout
// viewport size and device viewport size.
void set_device_viewport_size(const gfx::SizeF& size) {
device_viewport_size_ = size;
}
// Apply the scroll offset in layout space to the offset of the pinch-zoom
// viewport. The viewport cannot be scrolled outside of the layout viewport
// bounds. Returns the component of the scroll that is un-applied due to this
// constraint.
gfx::Vector2dF ApplyScroll(const gfx::Vector2dF);
// The implTransform goes from the origin of the unzoomedDeviceViewport to the
// origin of the zoomedDeviceViewport.
//
// implTransform = S[pageScale] * Tr[-zoomedDeviceViewportOffset]
gfx::Transform ImplTransform(bool page_scale_pinch_zoom_enabled) const;
private:
float page_scale_factor_;
float page_scale_delta_;
float sent_page_scale_delta_;
float max_page_scale_factor_;
float min_page_scale_factor_;
float device_scale_factor_;
gfx::Vector2dF zoomed_viewport_offset_;
gfx::SizeF layout_viewport_size_;
gfx::SizeF device_viewport_size_;
};
} // namespace cc
#endif // CC_PINCH_ZOOM_VIEWPORT_H_
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