+#include <kcolorutils.h>
+#include <kcolorscheme.h>
+#include <kdirlister.h>
+#include <kdirmodel.h>
+
+#include <QAbstractProxyModel>
+#include <QApplication>
+#include <QPoint>
+
+/*
+ * General implementation notes
+ * ----------------------------
+ *
+ * In Qt4.3 the QColumnView widget has a default behavior regarding the
+ * active column and the selection handling, which leads to some usability
+ * problems within Dolphin:
+ *
+ * - No matter which mouse button has been clicked: If the mouse is above
+ * a folder, the folder content will be loaded in the next column. The problem
+ * is that this column also will marked as 'active column' within QColumnView,
+ * hence it is not possible to select more than one folder within a column.
+ *
+ * - The currently opened folder is not always marked in the left column when
+ * doing drag & drop and selections inside other columns.
+ *
+ * - The currently active column is visually not recognizable.
+ *
+ * - It is not possible for derived classes to remove inactive columns.
+ *
+ * DolphinView tries to bypass those points, but this required some workarounds:
+ *
+ * - QColumnView internally maps the selection model from the ColumnView to the
+ * active column. As the active column from the Dolphin perspective is different
+ * as the active column from QColumnView, the selection model is adjusted on
+ * each interaction by the methods QColumnWidget::obtainSelectionModel(),
+ * QColumnWidget::releaseSelectionModel() and QColumnView::requestSelectionModel().
+ * QColumnView offers no hook to adjust this behavior, so those methods have to
+ * be invoked throughout the code...
+ *
+ * - Some copy/paste code from QColumnView is part of DolphinColumnView::createColumn(), but Qt 4.4
+ * will offer a solution for this.
+ *
+ * - The mousePressEvent() has been customized to prevent that folders are loaded on each
+ * mouse click.
+ *
+ * We'll try to give some input for Trolltech if the Dolphin solution is stable enough, so hopefully
+ * some workarounds can be removed when switching to Qt 4.4 or later.
+ */
+
+/**
+ * Represents one column inside the DolphinColumnView and has been
+ * extended to respect view options and hovering information.
+ */
+class ColumnWidget : public QListView
+{
+public:
+ ColumnWidget(QWidget* parent,
+ DolphinColumnView* columnView,
+ const KUrl& url);
+ virtual ~ColumnWidget();
+
+ /** Sets the size of the icons. */
+ void setDecorationSize(const QSize& size);
+
+ /**
+ * An active column is defined as column, which shows the same URL
+ * as indicated by the URL navigator. The active column is usually
+ * drawn in a lighter color. All operations are applied to this column.
+ */
+ void setActive(bool active);
+ inline bool isActive() const;
+
+ inline const KUrl& url() const;
+
+ /**
+ * Obtains the selection model from the column view. This assures that
+ * selections of the column view will always applied to the active column.
+ */
+ void obtainSelectionModel();
+
+ /**
+ * Releases the selection model from the column view and replaces it by
+ * a custom selection model.
+ */
+ void releaseSelectionModel();
+
+protected:
+ virtual QStyleOptionViewItem viewOptions() const;
+ virtual void dragEnterEvent(QDragEnterEvent* event);
+ virtual void dragLeaveEvent(QDragLeaveEvent* event);
+ virtual void dragMoveEvent(QDragMoveEvent* event);
+ virtual void dropEvent(QDropEvent* event);
+ virtual void mousePressEvent(QMouseEvent* event);
+ virtual void mouseMoveEvent(QMouseEvent* event);
+ virtual void mouseReleaseEvent(QMouseEvent* event);
+ virtual void paintEvent(QPaintEvent* event);
+ virtual void contextMenuEvent(QContextMenuEvent* event);
+
+protected slots:
+ virtual void selectionChanged(const QItemSelection& selected, const QItemSelection& deselected);
+
+private:
+ /** Used by ColumnWidget::setActive(). */
+ void activate();
+
+ /** Used by ColumnWidget::setActive(). */
+ void deactivate();
+
+private:
+ bool m_active;
+ bool m_swallowMouseMoveEvents;
+ DolphinColumnView* m_view;
+ KUrl m_url;
+ KUrl m_childUrl; // URL of the next column that is shown
+ QStyleOptionViewItem m_viewOptions;
+
+ bool m_dragging; // TODO: remove this property when the issue #160611 is solved in Qt 4.4
+ QRect m_dropRect; // TODO: remove this property when the issue #160611 is solved in Qt 4.4
+};
+
+ColumnWidget::ColumnWidget(QWidget* parent,
+ DolphinColumnView* columnView,
+ const KUrl& url) :
+ QListView(parent),
+ m_active(true),
+ m_swallowMouseMoveEvents(false),
+ m_view(columnView),
+ m_url(url),
+ m_childUrl(),
+ m_dragging(false),
+ m_dropRect()
+{
+ setMouseTracking(true);
+ viewport()->setAttribute(Qt::WA_Hover);
+
+ // apply the column mode settings to the widget
+ const ColumnModeSettings* settings = DolphinSettings::instance().columnModeSettings();
+ Q_ASSERT(settings != 0);
+
+ m_viewOptions = QListView::viewOptions();
+
+ QFont font(settings->fontFamily(), settings->fontSize());
+ font.setItalic(settings->italicFont());
+ font.setBold(settings->boldFont());
+ m_viewOptions.font = font;
+
+ const int iconSize = settings->iconSize();
+ m_viewOptions.decorationSize = QSize(iconSize, iconSize);
+
+ activate();
+}
+
+ColumnWidget::~ColumnWidget()
+{
+}
+
+void ColumnWidget::setDecorationSize(const QSize& size)
+{
+ m_viewOptions.decorationSize = size;
+ doItemsLayout();
+}
+
+void ColumnWidget::setActive(bool active)
+{
+ if (active) {
+ obtainSelectionModel();
+ } else {
+ releaseSelectionModel();
+ }
+
+ if (m_active == active) {
+ return;
+ }
+
+ m_active = active;
+
+ if (active) {
+ activate();
+ } else {
+ deactivate();
+ }
+}
+
+inline bool ColumnWidget::isActive() const
+{
+ return m_active;
+}
+
+const KUrl& ColumnWidget::url() const
+{
+ return m_url;
+}
+
+void ColumnWidget::obtainSelectionModel()
+{
+ if (selectionModel() != m_view->selectionModel()) {
+ selectionModel()->deleteLater();
+ setSelectionModel(m_view->selectionModel());
+ clearSelection();
+ }
+}
+
+void ColumnWidget::releaseSelectionModel()
+{
+ if (selectionModel() == m_view->selectionModel()) {
+ QItemSelectionModel* replacementModel = new QItemSelectionModel(model());
+ setSelectionModel(replacementModel);
+ }
+}
+
+QStyleOptionViewItem ColumnWidget::viewOptions() const
+{
+ return m_viewOptions;
+}
+
+void ColumnWidget::dragEnterEvent(QDragEnterEvent* event)
+{
+ if (event->mimeData()->hasUrls()) {
+ event->acceptProposedAction();
+ }
+
+ m_dragging = true;
+}
+
+void ColumnWidget::dragLeaveEvent(QDragLeaveEvent* event)
+{
+ QListView::dragLeaveEvent(event);
+
+ // TODO: remove this code when the issue #160611 is solved in Qt 4.4
+ m_dragging = false;
+ setDirtyRegion(m_dropRect);
+}
+
+void ColumnWidget::dragMoveEvent(QDragMoveEvent* event)
+{
+ QListView::dragMoveEvent(event);
+
+ // TODO: remove this code when the issue #160611 is solved in Qt 4.4
+ const QModelIndex index = indexAt(event->pos());
+ setDirtyRegion(m_dropRect);
+ m_dropRect = visualRect(index);
+ setDirtyRegion(m_dropRect);
+}
+
+void ColumnWidget::dropEvent(QDropEvent* event)
+{
+ const KUrl::List urls = KUrl::List::fromMimeData(event->mimeData());
+ if (!urls.isEmpty()) {
+ event->acceptProposedAction();
+ m_view->m_controller->indicateDroppedUrls(urls,
+ indexAt(event->pos()),
+ event->source());
+ }
+ QListView::dropEvent(event);
+ m_dragging = false;
+}
+
+void ColumnWidget::mousePressEvent(QMouseEvent* event)
+{
+ // On each mouse press event QColumnView triggers the loading of the
+ // current folder in the next column. This is not wanted for Dolphin when
+ // opening a context menu or when the CTRL modifier is pressed. Beside usability
+ // aspects the loading of the folder also implies losing the current selection,
+ // which makes it impossible to select folders from the current column. To bypass
+ // this behavior QListView::mousePressEvent() is not invoked in those cases, which
+ // is not a nice solution. Maybe another solution can be found in future versions
+ // of QColumnView.
+
+ m_view->requestSelectionModel(this);
+
+ bool swallowMousePressEvent = false;
+ const QModelIndex index = indexAt(event->pos());
+ if (index.isValid()) {
+ // a click on an item has been done
+ const QAbstractProxyModel* proxyModel = static_cast<const QAbstractProxyModel*>(m_view->model());
+ const KDirModel* dirModel = static_cast<const KDirModel*>(proxyModel->sourceModel());
+ const QModelIndex dirIndex = proxyModel->mapToSource(index);
+ KFileItem item = dirModel->itemForIndex(dirIndex);
+ if (!item.isNull()) {
+ QItemSelectionModel* selModel = selectionModel();
+
+ bool activate = true;
+ const Qt::KeyboardModifiers modifier = QApplication::keyboardModifiers();
+ if (modifier & Qt::ControlModifier) {
+ m_view->requestActivation(this);
+ if (!selModel->hasSelection()) {
+ // Assure to set the current index, so that a selection by the SHIFT key
+ // will work. TODO: If the index specifies a folder, the loading of the folder will
+ // be triggered by QColumnView although this is not wanted by Dolphin.
+ selModel->setCurrentIndex(index, QItemSelectionModel::Select);
+ }
+ selModel->select(index, QItemSelectionModel::Toggle);
+ swallowMousePressEvent = true;
+ } else if (item.isDir()) {
+ m_childUrl = item.url();
+ viewport()->update();
+
+ // Only request the activation if not the left button is pressed.
+ // The left button on a directory opens a new column, hence requesting
+ // an activation is useless as the new column will request the activation
+ // afterwards.
+ if (event->button() == Qt::LeftButton) {
+ activate = false;
+ }
+ }
+
+ if (activate) {
+ m_view->requestActivation(this);
+ }
+
+ // TODO: is the assumption OK that Qt::RightButton always represents the context menu button?
+ if (event->button() == Qt::RightButton) {
+ swallowMousePressEvent = true;
+ if (!selModel->isSelected(index)) {
+ clearSelection();
+ }
+ selModel->select(index, QItemSelectionModel::Select);
+ }
+ }
+ } else {
+ // a click on the viewport has been done
+ m_view->requestActivation(this);
+
+ // Swallow mouse move events if a click is done on the viewport. Otherwise the QColumnView
+ // triggers an unwanted loading of directories on hovering folder items.
+ m_swallowMouseMoveEvents = true;
+ clearSelection();
+ }
+
+ if (!swallowMousePressEvent) {
+ QListView::mousePressEvent(event);
+ }
+}
+
+void ColumnWidget::mouseMoveEvent(QMouseEvent* event)
+{
+ // see description in ColumnView::mousePressEvent()
+ if (!m_swallowMouseMoveEvents) {
+ QListView::mouseMoveEvent(event);
+ }
+}
+
+void ColumnWidget::mouseReleaseEvent(QMouseEvent* event)
+{
+ QListView::mouseReleaseEvent(event);
+ m_swallowMouseMoveEvents = false;
+}
+
+
+void ColumnWidget::paintEvent(QPaintEvent* event)
+{
+ if (!m_childUrl.isEmpty()) {
+ // indicate the shown URL of the next column by highlighting the shown folder item
+ const QAbstractProxyModel* proxyModel = static_cast<const QAbstractProxyModel*>(m_view->model());
+ const KDirModel* dirModel = static_cast<const KDirModel*>(proxyModel->sourceModel());
+ const QModelIndex dirIndex = dirModel->indexForUrl(m_childUrl);
+ const QModelIndex proxyIndex = proxyModel->mapFromSource(dirIndex);
+ if (proxyIndex.isValid() && !selectionModel()->isSelected(proxyIndex)) {
+ const QRect itemRect = visualRect(proxyIndex);
+ QPainter painter(viewport());
+ painter.save();
+
+ QColor color = KColorScheme(KColorScheme::View).foreground();
+ color.setAlpha(32);
+ painter.setPen(Qt::NoPen);
+ painter.setBrush(color);
+ painter.drawRect(itemRect);
+
+ painter.restore();
+ }
+ }
+
+ QListView::paintEvent(event);
+
+ // TODO: remove this code when the issue #160611 is solved in Qt 4.4
+ if (m_dragging) {
+ const QBrush& brush = m_viewOptions.palette.brush(QPalette::Normal, QPalette::Highlight);
+ DolphinController::drawHoverIndication(viewport(), m_dropRect, brush);
+ }
+}
+
+void ColumnWidget::contextMenuEvent(QContextMenuEvent* event)
+{
+ if (!m_active) {
+ m_view->requestActivation(this);
+ }
+
+ QListView::contextMenuEvent(event);
+
+ const QModelIndex index = indexAt(event->pos());
+ if (index.isValid() || m_active) {
+ // Only open a context menu above an item or if the mouse is above
+ // the active column.
+ const QPoint pos = m_view->viewport()->mapFromGlobal(event->globalPos());
+ m_view->m_controller->triggerContextMenuRequest(pos);
+ }
+}
+
+void ColumnWidget::selectionChanged(const QItemSelection& selected, const QItemSelection& deselected)
+{
+ // inactive views should not have any selection
+ if (!m_active) {
+ clearSelection();
+ }
+ QListView::selectionChanged(selected, deselected);
+}
+
+void ColumnWidget::activate()
+{
+ const QColor bgColor = KColorScheme(KColorScheme::View).background();
+ QPalette palette = viewport()->palette();
+ palette.setColor(viewport()->backgroundRole(), bgColor);
+ viewport()->setPalette(palette);
+
+ update();
+}
+
+void ColumnWidget::deactivate()
+{
+ QColor bgColor = KColorScheme(KColorScheme::View).background();
+ const QColor fgColor = KColorScheme(KColorScheme::View).foreground();
+ bgColor = KColorUtils::mix(bgColor, fgColor, 0.04);
+
+ QPalette palette = viewport()->palette();
+ palette.setColor(viewport()->backgroundRole(), bgColor);
+ viewport()->setPalette(palette);
+
+ update();
+}
+
+// ---
projects / dolphin.git / blobdiff