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
  13 #include <QGridLayout>
  14 #include <QResizeEvent>
  15 #include <QScrollArea>
  16 #include <QStyle>
  17 #include <QTimer>
  18
  19 using namespace SelectionMode;
  20
  21 BottomBar::BottomBar(KActionCollection *actionCollection, QWidget *parent) :
  22     QWidget{parent}
  23 {
  24     // Showing of this widget is normally animated. We hide it for now and make it small.
  25     hide();
  26     setMaximumHeight(0);
  27
  28     setSizePolicy(QSizePolicy::Minimum, QSizePolicy::Fixed);
  29     setMinimumWidth(0);
  30
  31     auto fillParentLayout = new QGridLayout(this);
  32     fillParentLayout->setContentsMargins(0, 0, 0, 0);
  33
  34     // Put the contents into a QScrollArea. This prevents increasing the view width
  35     // in case that not enough width for the contents is available. (this trick is also used in dolphinsearchbox.cpp.)
  36     m_scrollArea = new QScrollArea(this);
  37     fillParentLayout->addWidget(m_scrollArea);
  38     m_scrollArea->setFrameShape(QFrame::NoFrame);
  39     m_scrollArea->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
  40     m_scrollArea->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
  41     m_scrollArea->setWidgetResizable(true);
  42
  43     m_contentsContainer = new BottomBarContentsContainer(actionCollection, m_scrollArea);
  44     m_scrollArea->setWidget(m_contentsContainer);
  45     m_contentsContainer->installEventFilter(this); // Adjusts the height of this bar to the height of the contentsContainer
  46     connect(m_contentsContainer, &BottomBarContentsContainer::error, this, &BottomBar::error);
  47     connect(m_contentsContainer, &BottomBarContentsContainer::barVisibilityChangeRequested, this, [this](bool visible){
  48         if (!m_allowedToBeVisible && visible) {
  49             return;
  50         }
  51         setVisibleInternal(visible, WithAnimation);
  52     });
  53     connect(m_contentsContainer, &BottomBarContentsContainer::selectionModeLeavingRequested, this, &BottomBar::selectionModeLeavingRequested);
  54
  55     BackgroundColorHelper::instance()->controlBackgroundColor(this);
  56 }
  57
  58 void BottomBar::setVisible(bool visible, Animated animated)
  59 {
  60     m_allowedToBeVisible = visible;
  61     setVisibleInternal(visible, animated);
  62 }
  63
  64 void BottomBar::setVisibleInternal(bool visible, Animated animated)
  65 {
  66     Q_ASSERT_X(animated == WithAnimation, "SelectionModeBottomBar::setVisible", "This wasn't implemented.");
  67     if (!visible && contents() == PasteContents) {
  68         return; // The bar with PasteContents should not be hidden or users might not know how to paste what they just copied.
  69                 // Set contents to anything else to circumvent this prevention mechanism.
  70     }
  71     if (visible && !m_contentsContainer->hasSomethingToShow()) {
  72         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.
  73     }
  74
  75     setEnabled(visible);
  76     if (m_heightAnimation) {
  77         m_heightAnimation->stop(); // deletes because of QAbstractAnimation::DeleteWhenStopped.
  78     }
  79     m_heightAnimation = new QPropertyAnimation(this, "maximumHeight");
  80     m_heightAnimation->setDuration(2 *
  81             style()->styleHint(QStyle::SH_Widget_Animation_Duration, nullptr, this) *
  82             GlobalConfig::animationDurationFactor());
  83     m_heightAnimation->setStartValue(height());
  84     m_heightAnimation->setEasingCurve(QEasingCurve::OutCubic);
  85     if (visible) {
  86         show();
  87         m_heightAnimation->setEndValue(sizeHint().height());
  88         connect(m_heightAnimation, &QAbstractAnimation::finished,
  89                 this, [this](){ setMaximumHeight(sizeHint().height()); });
  90     } else {
  91         m_heightAnimation->setEndValue(0);
  92         connect(m_heightAnimation, &QAbstractAnimation::finished,
  93                 this, &QWidget::hide);
  94     }
  95
  96     m_heightAnimation->start(QAbstractAnimation::DeleteWhenStopped);
  97 }
  98
  99 QSize BottomBar::sizeHint() const
 100 {
 101     return QSize{1, m_contentsContainer->sizeHint().height()};
 102     // 1 as width because this widget should never be the reason the DolphinViewContainer is made wider.
 103 }
 104
 105 void BottomBar::slotSelectionChanged(const KFileItemList &selection, const QUrl &baseUrl)
 106 {
 107     m_contentsContainer->slotSelectionChanged(selection, baseUrl);
 108 }
 109
 110 void BottomBar::slotSplitTabDisabled()
 111 {
 112     switch (contents()) {
 113     case CopyToOtherViewContents:
 114     case MoveToOtherViewContents:
 115         Q_EMIT selectionModeLeavingRequested();
 116     default:
 117         return;
 118     }
 119 }
 120
 121 void BottomBar::resetContents(BottomBar::Contents contents)
 122 {
 123     m_contentsContainer->resetContents(contents);
 124
 125     if (m_allowedToBeVisible) {
 126         setVisibleInternal(true, WithAnimation);
 127     }
 128 }
 129
 130 BottomBar::Contents BottomBar::contents() const
 131 {
 132     return m_contentsContainer->contents();
 133 }
 134
 135 bool BottomBar::eventFilter(QObject *watched, QEvent *event)
 136 {
 137     Q_ASSERT(qobject_cast<QWidget *>(watched)); // This evenfFilter is only implemented for QWidgets.
 138
 139     switch (event->type()) {
 140     case QEvent::ChildAdded:
 141     case QEvent::ChildRemoved:
 142         QTimer::singleShot(0, this, [this]() {
 143             // The necessary height might have changed because of the added/removed child so we change the height manually.
 144             if (isVisibleTo(parentWidget()) && isEnabled() && (!m_heightAnimation || m_heightAnimation->state() != QAbstractAnimation::Running)) {
 145                 setMaximumHeight(sizeHint().height());
 146             }
 147         });
 148         // Fall through.
 149     default:
 150         return false;
 151     }
 152 }
 153
 154 void BottomBar::resizeEvent(QResizeEvent *resizeEvent)
 155 {
 156     if (resizeEvent->oldSize().width() == resizeEvent->size().width()) {
 157         // The width() didn't change so our custom override isn't needed.
 158         return QWidget::resizeEvent(resizeEvent);
 159     }
 160
 161     m_contentsContainer->adaptToNewBarWidth(width());
 162
 163     return QWidget::resizeEvent(resizeEvent);
 164 }