74 lines
2.4 KiB
C++
74 lines
2.4 KiB
C++
/*
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* Copyright 2009 David Nolden <david.nolden.kdevelop@art-master.de>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Library General Public License as
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* published by the Free Software Foundation; either version 2, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#ifndef PLASMA_PANELBACKGROUNDPROVIDER_H
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#define PLASMA_PANELBACKGROUNDPROVIDER_H
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namespace Plasma {
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class Theme;
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/**
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* A class that paints an additional background behind specific elements of a theme.
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* Construct it locally right before using it.
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*/
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class StandardThemeBackgroundProvider {
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public:
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/**
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* Constructs a background-provider for the given theme
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*/
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StandardThemeBackgroundProvider(Theme* theme, QString imagePath);
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/**
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* Applies the background to the given target. The target must have correct alpha-values,
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* so the background can be painted under it. Also the clip-region must be already set correctly
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* to restrict the area where the background is painted.
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* @param target The target where the background should be painted
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* @param offset Additional offset for the rendering: The render-source is translated by this offset
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*/
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void apply(QPainter& target) const;
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/**
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* Returns an identity that can be used for caching the result of the background rendering.
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* @return The identity string
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*/
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QString identity() const;
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static void clearCache();
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/**
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* Returns true if this background-provider will paint something
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*/
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operator bool() const;
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private:
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QColor m_color;
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QString m_pattern;
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int m_patternAlpha;
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int m_offsetX;
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int m_offsetY;
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bool m_valid;
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//Maps file-name to (image, alpha)
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typedef QPair<QImage, int> PatternAlphaPair; //The alpha value is statically applied to the pattern
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static QMap<QString, PatternAlphaPair > m_cachedPatterns;
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};
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}
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#endif
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