| /* |
| * Copyright (C) 2013 Google Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are |
| * met: |
| * |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above |
| * copyright notice, this list of conditions and the following disclaimer |
| * in the documentation and/or other materials provided with the |
| * distribution. |
| * * Neither the name of Google Inc. nor the names of its |
| * contributors may be used to endorse or promote products derived from |
| * this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #ifndef THIRD_PARTY_BLINK_RENDERER_CORE_FRAME_PAGE_SCALE_CONSTRAINTS_SET_H_ |
| #define THIRD_PARTY_BLINK_RENDERER_CORE_FRAME_PAGE_SCALE_CONSTRAINTS_SET_H_ |
| |
| #include <memory> |
| |
| #include "base/memory/ptr_util.h" |
| #include "third_party/blink/renderer/core/core_export.h" |
| #include "third_party/blink/renderer/core/frame/page_scale_constraints.h" |
| #include "third_party/blink/renderer/core/page/viewport_description.h" |
| #include "third_party/blink/renderer/platform/geometry/int_size.h" |
| #include "third_party/blink/renderer/platform/geometry/length.h" |
| #include "third_party/blink/renderer/platform/heap/handle.h" |
| #include "third_party/blink/renderer/platform/wtf/allocator.h" |
| |
| namespace blink { |
| |
| class Page; |
| |
| // This class harmonizes the viewport (particularly page scale) constraints from |
| // the meta viewport tag and other sources. |
| class CORE_EXPORT PageScaleConstraintsSet |
| : public GarbageCollected<PageScaleConstraintsSet> { |
| public: |
| static PageScaleConstraintsSet* Create(Page* page) { |
| return new PageScaleConstraintsSet(page); |
| } |
| |
| void Trace(blink::Visitor*); |
| |
| void SetDefaultConstraints(const PageScaleConstraints&); |
| const PageScaleConstraints& DefaultConstraints() const; |
| |
| // Settings defined in the website's viewport tag, if viewport tag support |
| // is enabled. |
| const PageScaleConstraints& PageDefinedConstraints() const { |
| return page_defined_constraints_; |
| } |
| void UpdatePageDefinedConstraints(const ViewportDescription&, |
| Length legacy_fallback_width); |
| void AdjustForAndroidWebViewQuirks(const ViewportDescription&, |
| int layout_fallback_width, |
| float device_scale_factor, |
| bool support_target_density_dpi, |
| bool wide_viewport_quirk_enabled, |
| bool use_wide_viewport, |
| bool load_with_overview_mode, |
| bool non_user_scalable_quirk_enabled); |
| void ClearPageDefinedConstraints(); |
| |
| // Constraints may also be set from Chromium -- this overrides any |
| // page-defined values. |
| const PageScaleConstraints& UserAgentConstraints() const { |
| return user_agent_constraints_; |
| } |
| void SetUserAgentConstraints(const PageScaleConstraints&); |
| |
| const PageScaleConstraints& FullscreenConstraints() const { |
| return fullscreen_constraints_; |
| } |
| void SetFullscreenConstraints(const PageScaleConstraints&); |
| |
| // Actual computed values, taking into account the above plus the current |
| // viewport size and document width. |
| const PageScaleConstraints& FinalConstraints() const { |
| return final_constraints_; |
| } |
| void ComputeFinalConstraints(); |
| void DidChangeContentsSize(IntSize contents_size, |
| int vertical_scrollbar_width, |
| float page_scale_factor); |
| |
| // This should be set to true on each page load to note that the page scale |
| // factor needs to be reset to its initial value. |
| void SetNeedsReset(bool); |
| bool NeedsReset() const { return needs_reset_; } |
| |
| // This is set when one of the inputs to finalConstraints changes. |
| bool ConstraintsDirty() const { return constraints_dirty_; } |
| |
| void DidChangeInitialContainingBlockSize(const IntSize&); |
| |
| IntSize GetLayoutSize() const; |
| IntSize InitialViewportSize() const { return icb_size_; } |
| |
| private: |
| PageScaleConstraintsSet(Page* page); |
| |
| PageScaleConstraints ComputeConstraintsStack() const; |
| |
| void AdjustFinalConstraintsToContentsSize(); |
| |
| PageScaleConstraints default_constraints_; |
| PageScaleConstraints page_defined_constraints_; |
| PageScaleConstraints user_agent_constraints_; |
| PageScaleConstraints fullscreen_constraints_; |
| PageScaleConstraints final_constraints_; |
| |
| Member<Page> page_; |
| |
| int last_contents_width_; |
| int last_vertical_scrollbar_width_; |
| IntSize icb_size_; |
| |
| bool needs_reset_; |
| bool constraints_dirty_; |
| }; |
| |
| } // namespace blink |
| |
| #endif // THIRD_PARTY_BLINK_RENDERER_CORE_FRAME_PAGE_SCALE_CONSTRAINTS_SET_H_ |