/* * Copyright (C) 2008-2017 Apple 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: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. 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. * * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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 APPLE INC. OR * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #pragma once #include "ThemeTypes.h" #include <wtf/Forward.h> namespace WebCore { class ControlStates; class FloatRect; class FontCascade; class FontCascadeDescription; class GraphicsContext; class LengthBox; class ScrollView; struct LengthSize; class Theme { public: static Theme& singleton(); // A function to obtain the baseline position adjustment for a "leaf" control. This will be used if a baseline // position cannot be determined by examining child content. Checkboxes and radio buttons are examples of // controls that need to do this. The adjustment is an offset that adds to the baseline, e.g., marginTop() + height() + |offset|. // The offset is not zoomed. virtual int baselinePositionAdjustment(ControlPart) const; // The font description result should have a zoomed font size. virtual std::optional<FontCascadeDescription> controlFont(ControlPart, const FontCascade&, float zoomFactor) const; // The size here is in zoomed coordinates already. If a new size is returned, it also needs to be in zoomed coordinates. virtual LengthSize controlSize(ControlPart, const FontCascade&, const LengthSize& zoomedSize, float zoomFactor) const; // Returns the minimum size for a control in zoomed coordinates. virtual LengthSize minimumControlSize(ControlPart, const FontCascade&, float zoomFactor) const; // Allows the theme to modify the existing padding/border. virtual LengthBox controlPadding(ControlPart, const FontCascade&, const LengthBox& zoomedBox, float zoomFactor) const; virtual LengthBox controlBorder(ControlPart, const FontCascade&, const LengthBox& zoomedBox, float zoomFactor) const; // Whether or not whitespace: pre should be forced on always. virtual bool controlRequiresPreWhiteSpace(ControlPart) const; // Method for painting a control. The rect is in zoomed coordinates. virtual void paint(ControlPart, ControlStates&, GraphicsContext&, const FloatRect& zoomedRect, float zoomFactor, ScrollView*, float deviceScaleFactor, float pageScaleFactor); // Some controls may spill out of their containers (e.g., the check on an OS X checkbox). When these controls repaint, // the theme needs to communicate this inflated rect to the engine so that it can invalidate the whole control. // The rect passed in is in zoomed coordinates, so the inflation should take that into account and make sure the inflation // amount is also scaled by the zoomFactor. virtual void inflateControlPaintRect(ControlPart, const ControlStates&, FloatRect& zoomedRect, float zoomFactor) const; virtual void drawNamedImage(const String&, GraphicsContext&, const FloatRect&) const; virtual bool userPrefersReducedMotion() const; protected: Theme() = default; virtual ~Theme() = default; private: Theme(const Theme&) = delete; void operator=(const Theme&) = delete; }; } // namespace WebCore