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5.15: qcommandlinkbutton.cpp original
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5.15.2/qtbase/src/widgets/widgets/qcommandlinkbutton.cpp
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413
5.15.2/qtbase/src/widgets/widgets/qcommandlinkbutton.cpp
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/****************************************************************************
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**
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** Copyright (C) 2016 The Qt Company Ltd.
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** Contact: https://www.qt.io/licensing/
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**
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** This file is part of the QtWidgets module of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and The Qt Company. For licensing terms
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** and conditions see https://www.qt.io/terms-conditions. For further
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** information use the contact form at https://www.qt.io/contact-us.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 3 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL3 included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU Lesser General Public License version 3 requirements
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** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
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**
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU
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** General Public License version 2.0 or (at your option) the GNU General
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** Public license version 3 or any later version approved by the KDE Free
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** Qt Foundation. The licenses are as published by the Free Software
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** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
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** included in the packaging of this file. Please review the following
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** information to ensure the GNU General Public License requirements will
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** be met: https://www.gnu.org/licenses/gpl-2.0.html and
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** https://www.gnu.org/licenses/gpl-3.0.html.
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "qcommandlinkbutton.h"
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#include "qstylepainter.h"
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#include "qstyleoption.h"
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#include "qtextdocument.h"
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#include "qtextlayout.h"
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#include "qcolor.h"
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#include "qfont.h"
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#include <qmath.h>
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#include "private/qpushbutton_p.h"
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QT_BEGIN_NAMESPACE
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/*!
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\class QCommandLinkButton
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\since 4.4
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\brief The QCommandLinkButton widget provides a Vista style command link button.
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\ingroup basicwidgets
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\inmodule QtWidgets
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The command link is a new control that was introduced by Windows Vista. Its
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intended use is similar to that of a radio button in that it is used to choose
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between a set of mutually exclusive options. Command link buttons should not
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be used by themselves but rather as an alternative to radio buttons in
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Wizards and dialogs and makes pressing the "next" button redundant.
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The appearance is generally similar to that of a flat pushbutton, but
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it allows for a descriptive text in addition to the normal button text.
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By default it will also carry an arrow icon, indicating that pressing the
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control will open another window or page.
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\sa QPushButton, QRadioButton
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*/
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/*!
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\property QCommandLinkButton::description
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\brief A descriptive label to complement the button text
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Setting this property will set a descriptive text on the
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button, complementing the text label. This will usually
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be displayed in a smaller font than the primary text.
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*/
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/*!
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\property QCommandLinkButton::flat
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\brief This property determines whether the button is displayed as a flat
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panel or with a border.
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By default, this property is set to false.
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\sa QPushButton::flat
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*/
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class QCommandLinkButtonPrivate : public QPushButtonPrivate
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{
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Q_DECLARE_PUBLIC(QCommandLinkButton)
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public:
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QCommandLinkButtonPrivate()
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: QPushButtonPrivate(){}
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void init();
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qreal titleSize() const;
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bool usingVistaStyle() const;
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QFont titleFont() const;
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QFont descriptionFont() const;
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QRect titleRect() const;
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QRect descriptionRect() const;
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int textOffset() const;
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int descriptionOffset() const;
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int descriptionHeight(int width) const;
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QColor mergedColors(const QColor &a, const QColor &b, int value) const;
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int topMargin() const { return 10; }
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int leftMargin() const { return 7; }
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int rightMargin() const { return 4; }
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int bottomMargin() const { return 10; }
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QString description;
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QColor currentColor;
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};
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// Mix colors a and b with a ratio in the range [0-255]
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QColor QCommandLinkButtonPrivate::mergedColors(const QColor &a, const QColor &b, int value = 50) const
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{
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Q_ASSERT(value >= 0);
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Q_ASSERT(value <= 255);
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QColor tmp = a;
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tmp.setRed((tmp.red() * value) / 255 + (b.red() * (255 - value)) / 255);
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tmp.setGreen((tmp.green() * value) / 255 + (b.green() * (255 - value)) / 255);
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tmp.setBlue((tmp.blue() * value) / 255 + (b.blue() * (255 - value)) / 255);
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return tmp;
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}
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QFont QCommandLinkButtonPrivate::titleFont() const
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{
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Q_Q(const QCommandLinkButton);
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QFont font = q->font();
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if (usingVistaStyle()) {
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font.setPointSizeF(12.0);
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} else {
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font.setBold(true);
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font.setPointSizeF(9.0);
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}
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// Note the font will be resolved against
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// QPainters font, so we need to restore the mask
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int resolve_mask = font.resolve_mask;
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QFont modifiedFont = q->font().resolve(font);
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modifiedFont.detach();
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modifiedFont.resolve_mask = resolve_mask;
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return modifiedFont;
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}
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QFont QCommandLinkButtonPrivate::descriptionFont() const
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{
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Q_Q(const QCommandLinkButton);
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QFont font = q->font();
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font.setPointSizeF(9.0);
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// Note the font will be resolved against
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// QPainters font, so we need to restore the mask
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int resolve_mask = font.resolve_mask;
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QFont modifiedFont = q->font().resolve(font);
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modifiedFont.detach();
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modifiedFont.resolve_mask = resolve_mask;
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return modifiedFont;
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}
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QRect QCommandLinkButtonPrivate::titleRect() const
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{
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Q_Q(const QCommandLinkButton);
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QRect r = q->rect().adjusted(textOffset(), topMargin(), -rightMargin(), 0);
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if (description.isEmpty())
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{
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QFontMetrics fm(titleFont());
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r.setTop(r.top() + qMax(0, (q->icon().actualSize(q->iconSize()).height()
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- fm.height()) / 2));
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}
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return r;
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}
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QRect QCommandLinkButtonPrivate::descriptionRect() const
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{
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Q_Q(const QCommandLinkButton);
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return q->rect().adjusted(textOffset(), descriptionOffset(),
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-rightMargin(), -bottomMargin());
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}
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int QCommandLinkButtonPrivate::textOffset() const
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{
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Q_Q(const QCommandLinkButton);
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return q->icon().actualSize(q->iconSize()).width() + leftMargin() + 6;
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}
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int QCommandLinkButtonPrivate::descriptionOffset() const
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{
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QFontMetrics fm(titleFont());
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return topMargin() + fm.height();
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}
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bool QCommandLinkButtonPrivate::usingVistaStyle() const
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{
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Q_Q(const QCommandLinkButton);
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//### This is a hack to detect if we are indeed running Vista style themed and not in classic
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// When we add api to query for this, we should change this implementation to use it.
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return q->style()->inherits("QWindowsVistaStyle")
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&& q->style()->pixelMetric(QStyle::PM_ButtonShiftHorizontal, nullptr) == 0;
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}
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void QCommandLinkButtonPrivate::init()
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{
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Q_Q(QCommandLinkButton);
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QPushButtonPrivate::init();
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q->setAttribute(Qt::WA_Hover);
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QSizePolicy policy(QSizePolicy::Preferred, QSizePolicy::Preferred, QSizePolicy::PushButton);
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policy.setHeightForWidth(true);
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q->setSizePolicy(policy);
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q->setIconSize(QSize(20, 20));
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QStyleOptionButton opt;
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q->initStyleOption(&opt);
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q->setIcon(q->style()->standardIcon(QStyle::SP_CommandLink, &opt));
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}
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// Calculates the height of the description text based on widget width
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int QCommandLinkButtonPrivate::descriptionHeight(int widgetWidth) const
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{
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// Calc width of actual paragraph
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int lineWidth = widgetWidth - textOffset() - rightMargin();
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qreal descriptionheight = 0;
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if (!description.isEmpty()) {
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QTextLayout layout(description);
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layout.setFont(descriptionFont());
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layout.beginLayout();
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while (true) {
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QTextLine line = layout.createLine();
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if (!line.isValid())
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break;
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line.setLineWidth(lineWidth);
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line.setPosition(QPointF(0, descriptionheight));
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descriptionheight += line.height();
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}
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layout.endLayout();
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}
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return qCeil(descriptionheight);
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}
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/*!
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\reimp
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*/
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QSize QCommandLinkButton::minimumSizeHint() const
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{
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Q_D(const QCommandLinkButton);
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QSize size = sizeHint();
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int minimumHeight = qMax(d->descriptionOffset() + d->bottomMargin(),
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icon().actualSize(iconSize()).height() + d->topMargin());
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size.setHeight(minimumHeight);
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return size;
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}
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/*!
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Constructs a command link with no text and a \a parent.
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*/
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QCommandLinkButton::QCommandLinkButton(QWidget *parent)
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: QPushButton(*new QCommandLinkButtonPrivate, parent)
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{
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Q_D(QCommandLinkButton);
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d->init();
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}
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/*!
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Constructs a command link with the parent \a parent and the text \a
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text.
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*/
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QCommandLinkButton::QCommandLinkButton(const QString &text, QWidget *parent)
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: QCommandLinkButton(parent)
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{
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setText(text);
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}
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/*!
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Constructs a command link with a \a text, a \a description, and a \a parent.
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*/
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QCommandLinkButton::QCommandLinkButton(const QString &text, const QString &description, QWidget *parent)
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: QCommandLinkButton(text, parent)
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{
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setDescription(description);
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}
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/*!
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Destructor.
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*/
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QCommandLinkButton::~QCommandLinkButton()
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{
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}
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/*! \reimp */
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bool QCommandLinkButton::event(QEvent *e)
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{
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return QPushButton::event(e);
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}
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/*! \reimp */
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QSize QCommandLinkButton::sizeHint() const
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{
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// Standard size hints from UI specs
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// Without note: 135, 41
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// With note: 135, 60
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Q_D(const QCommandLinkButton);
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QSize size = QPushButton::sizeHint();
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QFontMetrics fm(d->titleFont());
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int textWidth = qMax(fm.horizontalAdvance(text()), 135);
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int buttonWidth = textWidth + d->textOffset() + d->rightMargin();
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int heightWithoutDescription = d->descriptionOffset() + d->bottomMargin();
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size.setWidth(qMax(size.width(), buttonWidth));
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size.setHeight(qMax(d->description.isEmpty() ? 41 : 60,
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heightWithoutDescription + d->descriptionHeight(buttonWidth)));
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return size;
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}
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/*! \reimp */
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int QCommandLinkButton::heightForWidth(int width) const
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{
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Q_D(const QCommandLinkButton);
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int heightWithoutDescription = d->descriptionOffset() + d->bottomMargin();
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// find the width available for the description area
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return qMax(heightWithoutDescription + d->descriptionHeight(width),
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icon().actualSize(iconSize()).height() + d->topMargin() +
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d->bottomMargin());
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}
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/*! \reimp */
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void QCommandLinkButton::paintEvent(QPaintEvent *)
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{
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Q_D(QCommandLinkButton);
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QStylePainter p(this);
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p.save();
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QStyleOptionButton option;
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initStyleOption(&option);
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//Enable command link appearance on Vista
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option.features |= QStyleOptionButton::CommandLinkButton;
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option.text = QString();
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option.icon = QIcon(); //we draw this ourselves
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QSize pixmapSize = icon().actualSize(iconSize());
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const int vOffset = isDown()
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? style()->pixelMetric(QStyle::PM_ButtonShiftVertical, &option) : 0;
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const int hOffset = isDown()
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? style()->pixelMetric(QStyle::PM_ButtonShiftHorizontal, &option) : 0;
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//Draw icon
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p.drawControl(QStyle::CE_PushButton, option);
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if (!icon().isNull())
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p.drawPixmap(d->leftMargin() + hOffset, d->topMargin() + vOffset,
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icon().pixmap(pixmapSize, isEnabled() ? QIcon::Normal : QIcon::Disabled,
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isChecked() ? QIcon::On : QIcon::Off));
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//Draw title
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QColor textColor = palette().buttonText().color();
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if (isEnabled() && d->usingVistaStyle()) {
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textColor = QColor(21, 28, 85);
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if (underMouse() && !isDown())
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textColor = QColor(7, 64, 229);
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//A simple text color transition
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d->currentColor = d->mergedColors(textColor, d->currentColor, 60);
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option.palette.setColor(QPalette::ButtonText, d->currentColor);
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}
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int textflags = Qt::TextShowMnemonic;
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if (!style()->styleHint(QStyle::SH_UnderlineShortcut, &option, this))
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textflags |= Qt::TextHideMnemonic;
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p.setFont(d->titleFont());
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p.drawItemText(d->titleRect().translated(hOffset, vOffset),
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textflags, option.palette, isEnabled(), text(), QPalette::ButtonText);
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//Draw description
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textflags |= Qt::TextWordWrap | Qt::ElideRight;
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p.setFont(d->descriptionFont());
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||||||
|
p.drawItemText(d->descriptionRect().translated(hOffset, vOffset), textflags,
|
||||||
|
option.palette, isEnabled(), description(), QPalette::ButtonText);
|
||||||
|
p.restore();
|
||||||
|
}
|
||||||
|
|
||||||
|
void QCommandLinkButton::setDescription(const QString &description)
|
||||||
|
{
|
||||||
|
Q_D(QCommandLinkButton);
|
||||||
|
d->description = description;
|
||||||
|
updateGeometry();
|
||||||
|
update();
|
||||||
|
}
|
||||||
|
|
||||||
|
QString QCommandLinkButton::description() const
|
||||||
|
{
|
||||||
|
Q_D(const QCommandLinkButton);
|
||||||
|
return d->description;
|
||||||
|
}
|
||||||
|
|
||||||
|
QT_END_NAMESPACE
|
||||||
|
|
||||||
|
#include "moc_qcommandlinkbutton.cpp"
|
||||||
Loading…
Reference in New Issue
Block a user