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 <KActionCollection>
  15 #include <KFileItem>
  16 #include <KFileItemListProperties>
  17 #include <KStandardAction>
  18
  19 #include <QGridLayout>
  20 #include <QResizeEvent>
  21 #include <QScrollArea>
  22 #include <QStyle>
  23 #include <QtGlobal>
  24 #include <QTimer>
  25
  26 using namespace SelectionMode;
  27
  28 BottomBar::BottomBar(KActionCollection *actionCollection, QWidget *parent) :
  29     QWidget{parent}
  30 {
  31     // Showing of this widget is normally animated. We hide it for now and make it small.
  32     hide();
  33     setMaximumHeight(0);
  34
  35     setSizePolicy(QSizePolicy::Minimum, QSizePolicy::Fixed);
  36     setMinimumWidth(0);
  37
  38     auto fillParentLayout = new QGridLayout(this);
  39     fillParentLayout->setContentsMargins(0, 0, 0, 0);
  40
  41     // Put the contents into a QScrollArea. This prevents increasing the view width
  42     // in case that not enough width for the contents is available. (this trick is also used in dolphinsearchbox.cpp.)
  43     m_scrollArea = new QScrollArea(this);
  44     fillParentLayout->addWidget(m_scrollArea);
  45     m_scrollArea->setFrameShape(QFrame::NoFrame);
  46     m_scrollArea->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
  47     m_scrollArea->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
  48     m_scrollArea->setWidgetResizable(true);
  49
  50     m_contentsContainer = new BottomBarContentsContainer(actionCollection, m_scrollArea);
  51     m_scrollArea->setWidget(m_contentsContainer);
  52     m_contentsContainer->installEventFilter(this); // Adjusts the height of this bar to the height of the contentsContainer
  53     connect(m_contentsContainer, &BottomBarContentsContainer::error, this, &BottomBar::error);
  54     connect(m_contentsContainer, &BottomBarContentsContainer::barVisibilityChangeRequested, this, [this](bool visible){
  55         if (!m_allowedToBeVisible && visible) {
  56             return;
  57         }
  58         setVisibleInternal(visible, WithAnimation);
  59     });
  60     connect(m_contentsContainer, &BottomBarContentsContainer::leaveSelectionModeRequested, this, &BottomBar::leaveSelectionModeRequested);
  61
  62     BackgroundColorHelper::instance()->controlBackgroundColor(this);
  63 }
  64
  65 void BottomBar::setVisible(bool visible, Animated animated)
  66 {
  67     m_allowedToBeVisible = visible;
  68     setVisibleInternal(visible, animated);
  69 }
  70
  71 void BottomBar::setVisibleInternal(bool visible, Animated animated)
  72 {
  73     Q_ASSERT_X(animated == WithAnimation, "SelectionModeBottomBar::setVisible", "This wasn't implemented.");
  74     if (!visible && contents() == PasteContents) {
  75         return; // The bar with PasteContents should not be hidden or users might not know how to paste what they just copied.
  76                 // Set contents to anything else to circumvent this prevention mechanism.
  77     }
  78     if (visible && !m_contentsContainer->hasSomethingToShow()) {
  79         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.
  80     }
  81
  82     setEnabled(visible);
  83     if (m_heightAnimation) {
  84         m_heightAnimation->stop(); // deletes because of QAbstractAnimation::DeleteWhenStopped.
  85     }
  86     m_heightAnimation = new QPropertyAnimation(this, "maximumHeight");
  87     m_heightAnimation->setDuration(2 *
  88             style()->styleHint(QStyle::SH_Widget_Animation_Duration, nullptr, this) *
  89             GlobalConfig::animationDurationFactor());
  90
  91     m_heightAnimation->setStartValue(height());
  92     m_heightAnimation->setEasingCurve(QEasingCurve::OutCubic);
  93     if (visible) {
  94         show();
  95         m_heightAnimation->setEndValue(sizeHint().height());
  96         connect(m_heightAnimation, &QAbstractAnimation::finished,
  97                 this, [this](){ setMaximumHeight(sizeHint().height()); });
  98     } else {
  99         m_heightAnimation->setEndValue(0);
 100         connect(m_heightAnimation, &QAbstractAnimation::finished,
 101                 this, &QWidget::hide);
 102     }
 103
 104     m_heightAnimation->start(QAbstractAnimation::DeleteWhenStopped);
 105 }
 106
 107 QSize BottomBar::sizeHint() const
 108 {
 109     return QSize{1, m_contentsContainer->sizeHint().height()};
 110     // 1 as width because this widget should never be the reason the DolphinViewContainer is made wider.
 111 }
 112
 113 void BottomBar::slotSelectionChanged(const KFileItemList &selection, const QUrl &baseUrl)
 114 {
 115     m_contentsContainer->slotSelectionChanged(selection, baseUrl);
 116 }
 117
 118 void BottomBar::slotSplitTabDisabled()
 119 {
 120     switch (contents()) {
 121     case CopyToOtherViewContents:
 122     case MoveToOtherViewContents:
 123         Q_EMIT leaveSelectionModeRequested();
 124     default:
 125         return;
 126     }
 127 }
 128
 129 void BottomBar::resetContents(BottomBar::Contents contents)
 130 {
 131     m_contentsContainer->resetContents(contents);
 132
 133     if (m_allowedToBeVisible) {
 134         setVisibleInternal(true, WithAnimation);
 135     }
 136 }
 137
 138 BottomBar::Contents BottomBar::contents() const
 139 {
 140     return m_contentsContainer->contents();
 141 }
 142
 143 bool BottomBar::eventFilter(QObject *watched, QEvent *event)
 144 {
 145     Q_ASSERT(qobject_cast<QWidget *>(watched)); // This evenfFilter is only implemented for QWidgets.
 146
 147     switch (event->type()) {
 148     case QEvent::ChildAdded:
 149     case QEvent::ChildRemoved:
 150         QTimer::singleShot(0, this, [this]() {
 151             // The necessary height might have changed because of the added/removed child so we change the height manually.
 152             if (isVisibleTo(parentWidget()) && isEnabled() && (!m_heightAnimation || m_heightAnimation->state() != QAbstractAnimation::Running)) {
 153                 setMaximumHeight(sizeHint().height());
 154             }
 155         });
 156         // Fall through.
 157     default:
 158         return false;
 159     }
 160 }
 161
 162 void BottomBar::resizeEvent(QResizeEvent *resizeEvent)
 163 {
 164     if (resizeEvent->oldSize().width() == resizeEvent->size().width()) {
 165         // The width() didn't change so our custom override isn't needed.
 166         return QWidget::resizeEvent(resizeEvent);
 167     }
 168
 169     m_contentsContainer->updateForNewWidth();
 170
 171     return QWidget::resizeEvent(resizeEvent);
 172 }