src/selectionmode/bottombar.cpp

   1 /*
   2     This file is part of the KDE project
   3     SPDX-FileCopyrightText: 2022 Felix Ernst <felixernst@zohomail.eu>
   4
   5     SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
   6 */
   7
   8 #include "bottombar.h"
   9
  10 #include "bottombarcontentscontainer.h"
  11 #include "backgroundcolorhelper.h"
  12 #include "global.h"
  13
  14 #include <QGridLayout>
  15 #include <QResizeEvent>
  16 #include <QScrollArea>
  17 #include <QStyle>
  18 #include <QTimer>
  19
  20 using namespace SelectionMode;
  21
  22 BottomBar::BottomBar(KActionCollection *actionCollection, QWidget *parent) :
  23     QWidget{parent}
  24 {
  25     // Showing of this widget is normally animated. We hide it for now and make it small.
  26     hide();
  27     setMaximumHeight(0);
  28
  29     setSizePolicy(QSizePolicy::Minimum, QSizePolicy::Fixed);
  30     setMinimumWidth(0);
  31
  32     auto fillParentLayout = new QGridLayout(this);
  33     fillParentLayout->setContentsMargins(0, 0, 0, 0);
  34
  35     // Put the contents into a QScrollArea. This prevents increasing the view width
  36     // in case that not enough width for the contents is available. (this trick is also used in dolphinsearchbox.cpp.)
  37     m_scrollArea = new QScrollArea(this);
  38     fillParentLayout->addWidget(m_scrollArea);
  39     m_scrollArea->setFrameShape(QFrame::NoFrame);
  40     m_scrollArea->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
  41     m_scrollArea->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
  42     m_scrollArea->setWidgetResizable(true);
  43
  44     m_contentsContainer = new BottomBarContentsContainer(actionCollection, m_scrollArea);
  45     m_scrollArea->setWidget(m_contentsContainer);
  46     m_contentsContainer->installEventFilter(this); // Adjusts the height of this bar to the height of the contentsContainer
  47     connect(m_contentsContainer, &BottomBarContentsContainer::error, this, &BottomBar::error);
  48     connect(m_contentsContainer, &BottomBarContentsContainer::barVisibilityChangeRequested, this, [this](bool visible){
  49         if (!m_allowedToBeVisible && visible) {
  50             return;
  51         }
  52         setVisibleInternal(visible, WithAnimation);
  53     });
  54     connect(m_contentsContainer, &BottomBarContentsContainer::selectionModeLeavingRequested, this, &BottomBar::selectionModeLeavingRequested);
  55
  56     BackgroundColorHelper::instance()->controlBackgroundColor(this);
  57 }
  58
  59 void BottomBar::setVisible(bool visible, Animated animated)
  60 {
  61     m_allowedToBeVisible = visible;
  62     setVisibleInternal(visible, animated);
  63 }
  64
  65 void BottomBar::setVisibleInternal(bool visible, Animated animated)
  66 {
  67     Q_ASSERT_X(animated == WithAnimation, "SelectionModeBottomBar::setVisible", "This wasn't implemented.");
  68     if (!visible && contents() == PasteContents) {
  69         return; // The bar with PasteContents should not be hidden or users might not know how to paste what they just copied.
  70                 // Set contents to anything else to circumvent this prevention mechanism.
  71     }
  72     if (visible && !m_contentsContainer->hasSomethingToShow()) {
  73         return; // There is nothing on the bar that we want to show. We keep it invisible and only show it when the selection or the contents change.
  74     }
  75
  76     setEnabled(visible);
  77     if (m_heightAnimation) {
  78         m_heightAnimation->stop(); // deletes because of QAbstractAnimation::DeleteWhenStopped.
  79     }
  80     m_heightAnimation = new QPropertyAnimation(this, "maximumHeight");
  81     m_heightAnimation->setDuration(2 *
  82             style()->styleHint(QStyle::SH_Widget_Animation_Duration, nullptr, this) *
  83             GlobalConfig::animationDurationFactor());
  84     m_heightAnimation->setStartValue(height());
  85     m_heightAnimation->setEasingCurve(QEasingCurve::OutCubic);
  86     if (visible) {
  87         show();
  88         m_heightAnimation->setEndValue(sizeHint().height());
  89         connect(m_heightAnimation, &QAbstractAnimation::finished,
  90                 this, [this](){ setMaximumHeight(sizeHint().height()); });
  91     } else {
  92         m_heightAnimation->setEndValue(0);
  93         connect(m_heightAnimation, &QAbstractAnimation::finished,
  94                 this, &QWidget::hide);
  95     }
  96
  97     m_heightAnimation->start(QAbstractAnimation::DeleteWhenStopped);
  98 }
  99
 100 QSize BottomBar::sizeHint() const
 101 {
 102     return QSize{1, m_contentsContainer->sizeHint().height()};
 103     // 1 as width because this widget should never be the reason the DolphinViewContainer is made wider.
 104 }
 105
 106 void BottomBar::slotSelectionChanged(const KFileItemList &selection, const QUrl &baseUrl)
 107 {
 108     m_contentsContainer->slotSelectionChanged(selection, baseUrl);
 109 }
 110
 111 void BottomBar::slotSplitTabDisabled()
 112 {
 113     switch (contents()) {
 114     case CopyToOtherViewContents:
 115     case MoveToOtherViewContents:
 116         Q_EMIT selectionModeLeavingRequested();
 117     default:
 118         return;
 119     }
 120 }
 121
 122 void BottomBar::resetContents(BottomBar::Contents contents)
 123 {
 124     m_contentsContainer->resetContents(contents);
 125
 126     if (m_allowedToBeVisible) {
 127         setVisibleInternal(true, WithAnimation);
 128     }
 129 }
 130
 131 BottomBar::Contents BottomBar::contents() const
 132 {
 133     return m_contentsContainer->contents();
 134 }
 135
 136 bool BottomBar::eventFilter(QObject *watched, QEvent *event)
 137 {
 138     Q_ASSERT(qobject_cast<QWidget *>(watched)); // This evenfFilter is only implemented for QWidgets.
 139
 140     switch (event->type()) {
 141     case QEvent::ChildAdded:
 142     case QEvent::ChildRemoved:
 143         QTimer::singleShot(0, this, [this]() {
 144             // The necessary height might have changed because of the added/removed child so we change the height manually.
 145             if (isVisibleTo(parentWidget()) && isEnabled() && (!m_heightAnimation || m_heightAnimation->state() != QAbstractAnimation::Running)) {
 146                 setMaximumHeight(sizeHint().height());
 147             }
 148         });
 149         // Fall through.
 150     default:
 151         return false;
 152     }
 153 }
 154
 155 void BottomBar::resizeEvent(QResizeEvent *resizeEvent)
 156 {
 157     if (resizeEvent->oldSize().width() == resizeEvent->size().width()) {
 158         // The width() didn't change so our custom override isn't needed.
 159         return QWidget::resizeEvent(resizeEvent);
 160     }
 161
 162     m_contentsContainer->adaptToNewBarWidth(width());
 163
 164     return QWidget::resizeEvent(resizeEvent);
 165 }