Enable/Disable cut-copy-paste actions as required
Cut: focus widget has a selection, a 'cut' slot and 'canCut' Copy: focus widget has a selection and a 'copy' slot Paste: focus widget has a 'paste' slot and can accept the clipboard item
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Srivats P
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@ -19,10 +19,19 @@ along with this program. If not, see <http://www.gnu.org/licenses/>
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#include "clipboardhelper.h"
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#include "xtableview.h"
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#include <QAction>
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#include <QApplication>
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#include <QClipboard>
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#include <QIcon>
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#include <QItemSelection>
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#if 0 // change 0 to 1 for debug
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#define xDebug(...) qDebug(__VA_ARGS__)
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#else
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#define xDebug(...)
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#endif
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ClipboardHelper::ClipboardHelper(QObject *parent)
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: QObject(parent)
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@ -43,10 +52,13 @@ ClipboardHelper::ClipboardHelper(QObject *parent)
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connect(actionCopy_, SIGNAL(triggered()), SLOT(actionTriggered()));
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connect(actionPaste_, SIGNAL(triggered()), SLOT(actionTriggered()));
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#if 0 // FIXME: doesn't work correctly yet
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connect(qGuiApp, SIGNAL(focusChanged(QWidget*, QWidget*)),
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SLOT(updateClipboardActions()));
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#endif
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connect(qApp, SIGNAL(focusChanged(QWidget*, QWidget*)),
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SLOT(updateCutCopyStatus(QWidget*, QWidget*)));
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connect(qApp, SIGNAL(focusChanged(QWidget*, QWidget*)),
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SLOT(updatePasteStatus()));
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connect(QGuiApplication::clipboard(), SIGNAL(dataChanged()),
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SLOT(updatePasteStatus()));
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}
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QList<QAction*> ClipboardHelper::actions()
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@ -57,7 +69,7 @@ QList<QAction*> ClipboardHelper::actions()
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void ClipboardHelper::actionTriggered()
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{
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QWidget *focusWidget = QApplication::focusWidget();
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QWidget *focusWidget = qApp->focusWidget();
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if (!focusWidget)
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return;
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@ -66,7 +78,7 @@ void ClipboardHelper::actionTriggered()
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QString action = sender()->objectName()
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.remove("action").append("()").toLower();
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if (focusWidget->metaObject()->indexOfSlot(qPrintable(action)) < 0) {
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qDebug("%s slot not found for object %s:%s ",
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xDebug("%s slot not found for object %s:%s ",
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qPrintable(action),
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qPrintable(focusWidget->objectName()),
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focusWidget->metaObject()->className());
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@ -78,32 +90,126 @@ void ClipboardHelper::actionTriggered()
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Qt::DirectConnection);
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}
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void ClipboardHelper::updateActionStatus()
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void ClipboardHelper::updateCutCopyStatus(QWidget *old, QWidget *now)
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{
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QWidget *focusWidget = QApplication::focusWidget();
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if (!focusWidget)
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return;
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xDebug("In %s", __FUNCTION__);
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qDebug("In %s", __FUNCTION__);
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const QMetaObject *meta = focusWidget->metaObject();
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// FIXME: we should check if the mimeData's mimeType can be pasted in
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// the focusWidget
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actionPaste_->setEnabled(qGuiApp->clipboard()->mimeData()
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&& (meta->indexOfSlot("paste()") >= 0));
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bool hasSelection = false;
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if (meta->indexOfProperty("hasSelectedText") >= 0)
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hasSelection |= focusWidget->property("hasSelectedText").toBool();
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bool ret = false;
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if (meta->indexOfMethod("hasSelection()") >= 0) {
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if (QMetaObject::invokeMethod(focusWidget, "hasSelection",
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Qt::DirectConnection, Q_RETURN_ARG(bool, ret)))
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hasSelection |= ret;
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const XTableView *view = dynamic_cast<XTableView*>(old);
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if (view) {
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disconnect(view->selectionModel(),
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SIGNAL(selectionChanged(const QItemSelection&,
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const QItemSelection&)),
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this,
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SLOT(focusWidgetSelectionChanged(const QItemSelection&,
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const QItemSelection&)));
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disconnect(view->model(), SIGNAL(modelReset()),
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this, SLOT(focusWidgetModelReset()));
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}
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actionCut_->setEnabled(hasSelection && (meta->indexOfSlot("cut") >= 0));
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actionCopy_->setEnabled(hasSelection && (meta->indexOfSlot("copy") >= 0));
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if (!now) {
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xDebug("No focus widget to copy from");
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actionCut_->setEnabled(false);
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actionCopy_->setEnabled(false);
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return;
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}
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const QMetaObject *meta = now->metaObject();
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if (meta->indexOfSlot("copy()") < 0) {
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xDebug("Focus Widget (%s) doesn't have a copy slot",
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qPrintable(now->objectName()));
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actionCut_->setEnabled(false);
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actionCopy_->setEnabled(false);
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return;
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}
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view = dynamic_cast<XTableView*>(now);
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if (view) {
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connect(view->selectionModel(),
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SIGNAL(selectionChanged(const QItemSelection&,
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const QItemSelection&)),
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SLOT(focusWidgetSelectionChanged(const QItemSelection&,
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const QItemSelection&)));
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connect(view->model(), SIGNAL(modelReset()),
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this, SLOT(focusWidgetModelReset()));
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if (!view->hasSelection()) {
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xDebug("%s doesn't have anything selected to copy",
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qPrintable(view->objectName()));
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actionCut_->setEnabled(false);
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actionCopy_->setEnabled(false);
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return;
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}
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}
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xDebug("%s model can cut: %d", qPrintable(view->objectName()),
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view->canCut());
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actionCut_->setEnabled(view->canCut());
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xDebug("%s has a selection and copy slot: copy possible",
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qPrintable(now->objectName()));
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actionCopy_->setEnabled(true);
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}
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void ClipboardHelper::focusWidgetSelectionChanged(
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const QItemSelection &selected, const QItemSelection &/*deselected*/)
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{
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xDebug("In %s", __FUNCTION__);
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// Selection changed in the XTableView that has focus
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const XTableView *view = dynamic_cast<XTableView*>(qApp->focusWidget());
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xDebug("canCut:%d empty:%d", view->canCut(), selected.indexes().isEmpty());
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actionCut_->setEnabled(!selected.indexes().isEmpty()
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&& view && view->canCut());
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actionCopy_->setEnabled(!selected.indexes().isEmpty());
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}
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void ClipboardHelper::updatePasteStatus()
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{
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xDebug("In %s", __FUNCTION__);
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QWidget *focusWidget = qApp->focusWidget();
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if (!focusWidget) {
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xDebug("No focus widget to paste into");
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actionPaste_->setEnabled(false);
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return;
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}
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const QMimeData *item = QGuiApplication::clipboard()->mimeData();
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if (!item || item->formats().isEmpty()) {
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xDebug("Nothing on clipboard to paste");
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actionPaste_->setEnabled(false);
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return;
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}
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const QMetaObject *meta = focusWidget->metaObject();
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if (meta->indexOfSlot("paste()") < 0) {
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xDebug("Focus Widget (%s) doesn't have a paste slot",
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qPrintable(focusWidget->objectName()));
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actionPaste_->setEnabled(false);
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return;
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}
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const XTableView *view = dynamic_cast<XTableView*>(focusWidget);
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if (view && !view->canPaste(item)) {
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xDebug("%s cannot accept this item (%s)",
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qPrintable(view->objectName()),
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qPrintable(item->formats().join("|")));
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actionPaste_->setEnabled(false);
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return;
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}
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xDebug("%s can accept this item (%s): paste possible",
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qPrintable(focusWidget->objectName()),
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qPrintable(item->formats().join("|")));
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actionPaste_->setEnabled(true);
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}
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void ClipboardHelper::focusWidgetModelReset()
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{
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xDebug("In %s", __FUNCTION__);
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QWidget *focusWidget = qApp->focusWidget();
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updateCutCopyStatus(focusWidget, focusWidget); // re-eval cut/copy status
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}
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#undef xDebug
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@ -24,6 +24,7 @@ along with this program. If not, see <http://www.gnu.org/licenses/>
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#include <QList>
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class QAction;
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class QItemSelection;
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class ClipboardHelper : public QObject
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{
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@ -35,7 +36,11 @@ public:
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private slots:
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void actionTriggered();
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void updateActionStatus();
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void updateCutCopyStatus(QWidget *old, QWidget *now);
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void focusWidgetSelectionChanged(const QItemSelection &selected,
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const QItemSelection &deselected);
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void focusWidgetModelReset();
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void updatePasteStatus();
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private:
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QAction *actionCut_{nullptr};
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@ -109,6 +109,11 @@ QVariant LogsModel::data(const QModelIndex &index, int role) const
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return QVariant();
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}
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Qt::DropActions LogsModel::supportedDropActions() const
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{
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return Qt::IgnoreAction; // read-only model, doesn't accept any data
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}
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QStringList LogsModel::mimeTypes() const
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{
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return QStringList() << "text/plain";
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@ -43,6 +43,8 @@ public:
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QVariant headerData(int section, Qt::Orientation orientation,
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int role = Qt::DisplayRole) const;
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QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const;
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Qt::DropActions supportedDropActions() const;
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QStringList mimeTypes() const;
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QMimeData* mimeData(const QModelIndexList &indexes) const;
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@ -22,6 +22,9 @@ along with this program. If not, see <http://www.gnu.org/licenses/>
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#include <QTableView>
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#include "devicegroupmodel.h"
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#include "streammodel.h"
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#include <QApplication>
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#include <QClipboard>
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#include <QKeyEvent>
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@ -36,36 +39,33 @@ public:
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XTableView(QWidget *parent) : QTableView(parent) {}
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virtual ~XTableView() {}
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#if 0
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Q_INVOKABLE bool hasSelection() const
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void setModel(QAbstractItemModel *model)
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{
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// XXX: yes, this is hacky; but there's no way to figure out
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// if a model allows removeRows() or not
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if (dynamic_cast<StreamModel*>(model)
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|| dynamic_cast<DeviceGroupModel*>(model))
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_modelAllowsRemove = true;
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else
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_modelAllowsRemove = false;
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QTableView::setModel(model);
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}
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bool hasSelection() const
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{
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return !selectionModel()->selectedIndexes().isEmpty();
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}
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#endif
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protected:
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virtual void paintEvent(QPaintEvent *event)
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bool canCut() const
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{
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if (!model()->hasChildren()) {
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QPainter painter(viewport());
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style()->drawItemText(&painter, viewport()->rect(),
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layoutDirection() | Qt::AlignCenter, palette(),
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true, whatsThis(), QPalette::WindowText);
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}
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else
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QTableView::paintEvent(event);
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return _modelAllowsRemove;
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}
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virtual void keyPressEvent(QKeyEvent *event)
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bool canPaste(const QMimeData *data) const
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{
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if (event->matches(QKeySequence::Cut)) {
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cut();
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} else if (event->matches(QKeySequence::Copy)) {
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copy();
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} else if (event->matches(QKeySequence::Paste)) {
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paste();
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} else
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QTableView::keyPressEvent(event);
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return model()->canDropMimeData(data, Qt::CopyAction,
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0, 0, QModelIndex());
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}
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public slots:
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@ -102,7 +102,7 @@ public slots:
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{
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const QMimeData *mimeData = qApp->clipboard()->mimeData();
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if (!mimeData)
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if (!mimeData || mimeData->formats().isEmpty())
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return;
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if (selectionModel()->hasSelection()
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@ -128,6 +128,34 @@ public slots:
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model()->dropMimeData(mimeData, Qt::CopyAction,
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row, column, QModelIndex());
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}
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protected:
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virtual void paintEvent(QPaintEvent *event)
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{
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if (!model()->hasChildren()) {
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QPainter painter(viewport());
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style()->drawItemText(&painter, viewport()->rect(),
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layoutDirection() | Qt::AlignCenter, palette(),
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true, whatsThis(), QPalette::WindowText);
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}
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else
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QTableView::paintEvent(event);
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}
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virtual void keyPressEvent(QKeyEvent *event)
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{
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if (event->matches(QKeySequence::Cut)) {
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cut();
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} else if (event->matches(QKeySequence::Copy)) {
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copy();
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} else if (event->matches(QKeySequence::Paste)) {
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paste();
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} else
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QTableView::keyPressEvent(event);
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}
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private:
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bool _modelAllowsRemove{false};
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};
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#endif
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