src/animatedheightwidget.cpp

   1 /*
   2     This file is part of the KDE project
   3     SPDX-FileCopyrightText: 2024 Felix Ernst <felixernst@kde.org>
   4
   5     SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
   6 */
   7
   8 #include "animatedheightwidget.h"
   9
  10 #include <QGridLayout>
  11 #include <QPropertyAnimation>
  12 #include <QScrollArea>
  13 #include <QStyle>
  14
  15 AnimatedHeightWidget::AnimatedHeightWidget(QWidget *parent)
  16     : QWidget{parent}
  17 {
  18     // Showing of this widget is normally animated. We hide it for now and make it small.
  19     hide();
  20     setMaximumHeight(0);
  21
  22     auto fillParentLayout = new QGridLayout(this);
  23     fillParentLayout->setContentsMargins(0, 0, 0, 0);
  24
  25     // Put the contents into a QScrollArea. This prevents increasing the view width
  26     // in case there is not enough available width for the contents.
  27     m_contentsContainerParent = new QScrollArea(this);
  28     fillParentLayout->addWidget(m_contentsContainerParent);
  29     m_contentsContainerParent->setFrameShape(QFrame::NoFrame);
  30     m_contentsContainerParent->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
  31     m_contentsContainerParent->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
  32     m_contentsContainerParent->setWidgetResizable(true);
  33
  34     setMinimumWidth(0);
  35 }
  36
  37 QSize AnimatedHeightWidget::sizeHint() const
  38 {
  39     return QSize{1, preferredHeight()};
  40     // 1 as width because this widget should never be the reason the DolphinViewContainer is made wider.
  41 }
  42
  43 void AnimatedHeightWidget::setVisible(bool visible, Animated animated)
  44 {
  45     setEnabled(visible);
  46     if (m_heightAnimation) {
  47         m_heightAnimation->stop(); // deletes because of QAbstractAnimation::DeleteWhenStopped.
  48     }
  49
  50     if (animated == WithAnimation
  51         && (style()->styleHint(QStyle::SH_Widget_Animation_Duration, nullptr, this) < 1 || GlobalConfig::animationDurationFactor() <= 0.0)) {
  52         animated = WithoutAnimation;
  53     }
  54
  55     if (animated == WithoutAnimation) {
  56         setMaximumHeight(visible ? preferredHeight() : 0);
  57         setVisible(visible);
  58         return;
  59     }
  60
  61     m_heightAnimation = new QPropertyAnimation(this, "maximumHeight");
  62     m_heightAnimation->setDuration(2 * style()->styleHint(QStyle::SH_Widget_Animation_Duration, nullptr, this) * GlobalConfig::animationDurationFactor());
  63
  64     m_heightAnimation->setStartValue(height());
  65     m_heightAnimation->setEasingCurve(QEasingCurve::OutCubic);
  66     if (visible) {
  67         show();
  68         m_heightAnimation->setEndValue(preferredHeight());
  69     } else {
  70         m_heightAnimation->setEndValue(0);
  71         connect(m_heightAnimation, &QAbstractAnimation::finished, this, &QWidget::hide);
  72     }
  73
  74     m_heightAnimation->start(QAbstractAnimation::DeleteWhenStopped);
  75 }
  76
  77 QWidget *AnimatedHeightWidget::prepareContentsContainer(QWidget *contentsContainer)
  78 {
  79     Q_ASSERT_X(!m_contentsContainerParent->widget(),
  80                "AnimatedHeightWidget::prepareContentsContainer",
  81                "Another contentsContainer has already been prepared. There can only be one.");
  82     contentsContainer->setParent(m_contentsContainerParent);
  83     m_contentsContainerParent->setWidget(contentsContainer);
  84     m_contentsContainerParent->setFocusProxy(contentsContainer);
  85     return contentsContainer;
  86 }
  87
  88 bool AnimatedHeightWidget::isAnimationRunning() const
  89 {
  90     return m_heightAnimation && m_heightAnimation->state() == QAbstractAnimation::Running;
  91 }