src/selectionmode/topbar.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 "topbar.h"
   9
  10 #include "backgroundcolorhelper.h"
  11
  12 #include <KColorScheme>
  13 #include <KLocalizedString>
  14 #include <KToolTipHelper>
  15
  16 #include <QHBoxLayout>
  17 #include <QLabel>
  18 #include <QPropertyAnimation>
  19 #include <QPushButton>
  20 #include <QScrollArea>
  21 #include <QStyle>
  22
  23 using namespace SelectionMode;
  24
  25 TopBar::TopBar(QWidget *parent) :
  26     QWidget{parent}
  27 {
  28     // Showing of this widget is normally animated. We hide it for now and make it small.
  29     hide();
  30     setMaximumHeight(0);
  31
  32     setToolTip(KToolTipHelper::whatsThisHintOnly());
  33     setWhatsThis(xi18nc("@info:whatsthis", "<title>Selection Mode</title><para>Select files or folders to manage or manipulate them."
  34         "<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>"
  35         "<item>Pressing an empty area does <emphasis>not</emphasis> clear the selection.</item>"
  36         "<item>Selection rectangles (created by dragging from an empty area) invert the selection status of items within.</item></list></para>"
  37         "<para>The available action buttons at the bottom change depending on the current selection.</para>"));
  38
  39     auto fillParentLayout = new QGridLayout(this);
  40     fillParentLayout->setContentsMargins(0, 0, 0, 0);
  41
  42     // Put the contents into a QScrollArea. This prevents increasing the view width
  43     // in case that not enough width for the contents is available. (this trick is also used in bottombar.cpp.)
  44     auto scrollArea = new QScrollArea(this);
  45     fillParentLayout->addWidget(scrollArea);
  46     scrollArea->setFrameShape(QFrame::NoFrame);
  47     scrollArea->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
  48     scrollArea->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
  49     scrollArea->setWidgetResizable(true);
  50
  51     auto contentsContainer = new QWidget(scrollArea);
  52     scrollArea->setWidget(contentsContainer);
  53
  54     BackgroundColorHelper::instance()->controlBackgroundColor(this);
  55
  56     setMinimumWidth(0);
  57
  58     m_fullLabelString = i18nc("@info label above the view explaining the state",
  59                                      "Selection Mode: Click on files or folders to select or deselect them.");
  60     m_shortLabelString = i18nc("@info label above the view explaining the state",
  61                                      "Selection Mode");
  62     m_label = new QLabel(contentsContainer);
  63     m_label->setMinimumWidth(0);
  64     BackgroundColorHelper::instance()->controlBackgroundColor(m_label);
  65
  66     m_closeButton = new QPushButton(QIcon::fromTheme(QStringLiteral("window-close-symbolic")), "", contentsContainer);
  67     m_closeButton->setText(i18nc("@action:button", "Exit Selection Mode"));
  68     m_closeButton->setFlat(true);
  69     connect(m_closeButton, &QAbstractButton::clicked,
  70             this, &TopBar::selectionModeLeavingRequested);
  71
  72     QHBoxLayout *layout = new QHBoxLayout(contentsContainer);
  73     auto contentsMargins = layout->contentsMargins();
  74     m_preferredHeight = contentsMargins.top() + m_label->sizeHint().height() + contentsMargins.bottom();
  75     scrollArea->setMaximumHeight(m_preferredHeight);
  76     m_closeButton->setFixedHeight(m_preferredHeight);
  77     layout->setContentsMargins(0, 0, 0, 0);
  78
  79     layout->addStretch();
  80     layout->addWidget(m_label);
  81     layout->addStretch();
  82     layout->addWidget(m_closeButton);
  83 }
  84
  85 void TopBar::setVisible(bool visible, Animated animated)
  86 {
  87     Q_ASSERT_X(animated == WithAnimation, "SelectionModeTopBar::setVisible", "This wasn't implemented.");
  88
  89     if (m_heightAnimation) {
  90         m_heightAnimation->stop(); // deletes because of QAbstractAnimation::DeleteWhenStopped.
  91     }
  92     m_heightAnimation = new QPropertyAnimation(this, "maximumHeight");
  93     m_heightAnimation->setDuration(2 *
  94             style()->styleHint(QStyle::SH_Widget_Animation_Duration, nullptr, this) *
  95             GlobalConfig::animationDurationFactor());
  96
  97     m_heightAnimation->setStartValue(height());
  98     m_heightAnimation->setEasingCurve(QEasingCurve::OutCubic);
  99     if (visible) {
 100         show();
 101         m_heightAnimation->setEndValue(m_preferredHeight);
 102     } else {
 103         m_heightAnimation->setEndValue(0);
 104         connect(m_heightAnimation, &QAbstractAnimation::finished,
 105                 this, &QWidget::hide);
 106     }
 107
 108     m_heightAnimation->start(QAbstractAnimation::DeleteWhenStopped);
 109 }
 110
 111 void TopBar::resizeEvent(QResizeEvent *resizeEvent)
 112 {
 113     updateLabelString();
 114     return QWidget::resizeEvent(resizeEvent);
 115 }
 116
 117 void TopBar::updateLabelString()
 118 {
 119     QFontMetrics fontMetrics = m_label->fontMetrics();
 120     if (fontMetrics.horizontalAdvance(m_fullLabelString) + m_closeButton->sizeHint().width() + style()->pixelMetric(QStyle::PM_LayoutLeftMargin) * 2 + style()->pixelMetric(QStyle::PM_LayoutRightMargin) * 2 < width()) {
 121         m_label->setText(m_fullLabelString);
 122     } else {
 123         m_label->setText(m_shortLabelString);
 124     }
 125 }