Better separation of classes

Make obvious when actions trigger selection mode.

1 files changed, 172 insertions, 0 deletions

diff --git a/src/selectionmode/bottombar.cpp b/src/selectionmode/bottombar.cpp
new file mode 100644
index 000000000..999b24ae4
--- /dev/null
+++ b/src/selectionmode/bottombar.cpp
@@ -0,0 +1,172 @@
+/*
+    This file is part of the KDE project
+    SPDX-FileCopyrightText: 2022 Felix Ernst <[email protected]>
+
+    SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
+*/
+
+#include "bottombar.h"
+
+#include "bottombarcontentscontainer.h"
+#include "backgroundcolorhelper.h"
+#include "global.h"
+
+#include <KActionCollection>
+#include <KFileItem>
+#include <KFileItemListProperties>
+#include <KStandardAction>
+
+#include <QGridLayout>
+#include <QResizeEvent>
+#include <QScrollArea>
+#include <QStyle>
+#include <QtGlobal>
+#include <QTimer>
+
+using namespace SelectionMode;
+
+BottomBar::BottomBar(KActionCollection *actionCollection, QWidget *parent) :
+    QWidget{parent}
+{
+    // Showing of this widget is normally animated. We hide it for now and make it small.
+    hide();
+    setMaximumHeight(0);
+
+    setSizePolicy(QSizePolicy::Minimum, QSizePolicy::Fixed);
+    setMinimumWidth(0);
+
+    auto fillParentLayout = new QGridLayout(this);
+    fillParentLayout->setContentsMargins(0, 0, 0, 0);
+
+    // Put the contents into a QScrollArea. This prevents increasing the view width
+    // in case that not enough width for the contents is available. (this trick is also used in dolphinsearchbox.cpp.)
+    m_scrollArea = new QScrollArea(this);
+    fillParentLayout->addWidget(m_scrollArea);
+    m_scrollArea->setFrameShape(QFrame::NoFrame);
+    m_scrollArea->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
+    m_scrollArea->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
+    m_scrollArea->setWidgetResizable(true);
+
+    m_contentsContainer = new BottomBarContentsContainer(actionCollection, m_scrollArea);
+    m_scrollArea->setWidget(m_contentsContainer);
+    m_contentsContainer->installEventFilter(this); // Adjusts the height of this bar to the height of the contentsContainer
+    connect(m_contentsContainer, &BottomBarContentsContainer::error, this, &BottomBar::error);
+    connect(m_contentsContainer, &BottomBarContentsContainer::barVisibilityChangeRequested, this, [this](bool visible){
+        if (!m_allowedToBeVisible && visible) {
+            return;
+        }
+        setVisibleInternal(visible, WithAnimation);
+    });
+    connect(m_contentsContainer, &BottomBarContentsContainer::leaveSelectionModeRequested, this, &BottomBar::leaveSelectionModeRequested);
+
+    BackgroundColorHelper::instance()->controlBackgroundColor(this);
+}
+
+void BottomBar::setVisible(bool visible, Animated animated)
+{
+    m_allowedToBeVisible = visible;
+    setVisibleInternal(visible, animated);
+}
+
+void BottomBar::setVisibleInternal(bool visible, Animated animated)
+{
+    Q_ASSERT_X(animated == WithAnimation, "SelectionModeBottomBar::setVisible", "This wasn't implemented.");
+    if (!visible && contents() == PasteContents) {
+        return; // The bar with PasteContents should not be hidden or users might not know how to paste what they just copied.
+                // Set contents to anything else to circumvent this prevention mechanism.
+    }
+    if (visible && !m_contentsContainer->hasSomethingToShow()) {
+        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.
+    }
+
+    setEnabled(visible);
+    if (m_heightAnimation) {
+        m_heightAnimation->stop(); // deletes because of QAbstractAnimation::DeleteWhenStopped.
+    }
+    m_heightAnimation = new QPropertyAnimation(this, "maximumHeight");
+    m_heightAnimation->setDuration(2 *
+            style()->styleHint(QStyle::SH_Widget_Animation_Duration, nullptr, this) *
+            GlobalConfig::animationDurationFactor());
+
+    m_heightAnimation->setStartValue(height());
+    m_heightAnimation->setEasingCurve(QEasingCurve::OutCubic);
+    if (visible) {
+        show();
+        m_heightAnimation->setEndValue(sizeHint().height());
+        connect(m_heightAnimation, &QAbstractAnimation::finished,
+                this, [this](){ setMaximumHeight(sizeHint().height()); });
+    } else {
+        m_heightAnimation->setEndValue(0);
+        connect(m_heightAnimation, &QAbstractAnimation::finished,
+                this, &QWidget::hide);
+    }
+
+    m_heightAnimation->start(QAbstractAnimation::DeleteWhenStopped);
+}
+
+QSize BottomBar::sizeHint() const
+{
+    return QSize{1, m_contentsContainer->sizeHint().height()};
+    // 1 as width because this widget should never be the reason the DolphinViewContainer is made wider.
+}
+
+void BottomBar::slotSelectionChanged(const KFileItemList &selection, const QUrl &baseUrl)
+{
+    m_contentsContainer->slotSelectionChanged(selection, baseUrl);
+}
+
+void BottomBar::slotSplitTabDisabled()
+{
+    switch (contents()) {
+    case CopyToOtherViewContents:
+    case MoveToOtherViewContents:
+        Q_EMIT leaveSelectionModeRequested();
+    default:
+        return;
+    }
+}
+
+void BottomBar::resetContents(BottomBar::Contents contents)
+{
+    m_contentsContainer->resetContents(contents);
+
+    if (m_allowedToBeVisible) {
+        setVisibleInternal(true, WithAnimation);
+    }
+}
+
+BottomBar::Contents BottomBar::contents() const
+{
+    return m_contentsContainer->contents();
+}
+
+bool BottomBar::eventFilter(QObject *watched, QEvent *event)
+{
+    Q_ASSERT(qobject_cast<QWidget *>(watched)); // This evenfFilter is only implemented for QWidgets.
+
+    switch (event->type()) {
+    case QEvent::ChildAdded:
+    case QEvent::ChildRemoved:
+        QTimer::singleShot(0, this, [this]() {
+            // The necessary height might have changed because of the added/removed child so we change the height manually.
+            if (isVisibleTo(parentWidget()) && isEnabled() && (!m_heightAnimation || m_heightAnimation->state() != QAbstractAnimation::Running)) {
+                setMaximumHeight(sizeHint().height());
+            }
+        });
+        // Fall through.
+    default:
+        return false;
+    }
+}
+
+void BottomBar::resizeEvent(QResizeEvent *resizeEvent)
+{
+    if (resizeEvent->oldSize().width() == resizeEvent->size().width()) {
+        // The width() didn't change so our custom override isn't needed.
+        return QWidget::resizeEvent(resizeEvent);
+    }
+
+    m_contentsContainer->updateForNewWidth();
+
+    return QWidget::resizeEvent(resizeEvent);
+}