1 files changed, 127 insertions, 0 deletions
diff --git a/src/selectionmode/topbar.cpp b/src/selectionmode/topbar.cpp
new file mode 100644
index 000000000..d783c76ca
--- /dev/null
+++ b/src/selectionmode/topbar.cpp
@@ -0,0 +1,127 @@
+/*
+    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 "topbar.h"
+
+#include "backgroundcolorhelper.h"
+
+#include <KColorScheme>
+#include <KLocalizedString>
+#include <KToolTipHelper>
+
+#include <QHBoxLayout>
+#include <QLabel>
+#include <QPalette>
+#include <QPropertyAnimation>
+#include <QPushButton>
+#include <QScrollArea>
+#include <QStyle>
+#include <QtGlobal>
+
+using namespace SelectionMode;
+
+TopBar::TopBar(QWidget *parent) :
+    QWidget{parent}
+{
+    // Showing of this widget is normally animated. We hide it for now and make it small.
+    hide();
+    setMaximumHeight(0);
+
+    setToolTip(KToolTipHelper::whatsThisHintOnly());
+    setWhatsThis(xi18nc("@info:whatsthis", "<title>Selection Mode</title><para>Select files or folders to manage or manipulate them."
+        "<list><item>Press on a file or folder to select it.</item><item>Press on an already selected file or folder to deselect it.</item>"
+        "<item>Pressing an empty area does <emphasis>not</emphasis> clear the selection.</item>"
+        "<item>Selection rectangles (created by dragging from an empty area) invert the selection status of items within.</item></list></para>"
+        "<para>The available action buttons at the bottom change depending on the current selection.</para>"));
+
+    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 selectionmodebottombar.cpp.)
+    auto scrollArea = new QScrollArea(this);
+    fillParentLayout->addWidget(scrollArea);
+    scrollArea->setFrameShape(QFrame::NoFrame);
+    scrollArea->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
+    scrollArea->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
+    scrollArea->setWidgetResizable(true);
+
+    auto contentsContainer = new QWidget(scrollArea);
+    scrollArea->setWidget(contentsContainer);
+
+    BackgroundColorHelper::instance()->controlBackgroundColor(this);
+
+    setMinimumWidth(0);
+
+    m_fullLabelString = i18nc("@info label above the view explaining the state",
+                                     "Selection Mode: Click on files or folders to select or deselect them.");
+    m_shortLabelString = i18nc("@info label above the view explaining the state",
+                                     "Selection Mode");
+    m_label = new QLabel(contentsContainer);
+    m_label->setMinimumWidth(0);
+    BackgroundColorHelper::instance()->controlBackgroundColor(m_label);
+
+    m_closeButton = new QPushButton(QIcon::fromTheme(QStringLiteral("window-close-symbolic")), "", contentsContainer);
+    m_closeButton->setToolTip(i18nc("@action:button", "Exit Selection Mode"));
+    m_closeButton->setAccessibleName(m_closeButton->toolTip());
+    m_closeButton->setFlat(true);
+    connect(m_closeButton, &QAbstractButton::pressed,
+            this, &TopBar::leaveSelectionModeRequested);
+
+    QHBoxLayout *layout = new QHBoxLayout(contentsContainer);
+    auto contentsMargins = layout->contentsMargins();
+    m_preferredHeight = contentsMargins.top() + m_label->sizeHint().height() + contentsMargins.bottom();
+    scrollArea->setMaximumHeight(m_preferredHeight);
+    m_closeButton->setFixedHeight(m_preferredHeight);
+    layout->setContentsMargins(0, 0, 0, 0);
+
+    layout->addStretch();
+    layout->addWidget(m_label);
+    layout->addStretch();
+    layout->addWidget(m_closeButton);
+}
+
+void TopBar::setVisible(bool visible, Animated animated)
+{
+    Q_ASSERT_X(animated == WithAnimation, "SelectionModeTopBar::setVisible", "This wasn't implemented.");
+
+    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(m_preferredHeight);
+    } else {
+        m_heightAnimation->setEndValue(0);
+        connect(m_heightAnimation, &QAbstractAnimation::finished,
+                this, &QWidget::hide);
+    }
+
+    m_heightAnimation->start(QAbstractAnimation::DeleteWhenStopped);
+}
+
+void TopBar::resizeEvent(QResizeEvent */* resizeEvent */)
+{
+    updateLabelString();
+}
+
+void TopBar::updateLabelString()
+{
+    QFontMetrics fontMetrics = m_label->fontMetrics();
+    if (fontMetrics.horizontalAdvance(m_fullLabelString) + m_closeButton->sizeHint().width() + style()->pixelMetric(QStyle::PM_LayoutLeftMargin) * 2 + style()->pixelMetric(QStyle::PM_LayoutRightMargin) * 2 < width()) {
+        m_label->setText(m_fullLabelString);
+    } else {
+        m_label->setText(m_shortLabelString);
+    }
+}