Add Selection Mode

The selection mode action is a checkable toggle action named
"Select Files and Folders" which has "Space" as the default
shortcut.

In selection mode a bottom bar with contextual actions is shown.
These should mostly mirror the actions which are available through
the right-click context menu aka DolphinContextMenu.

Resizing of the window might make a overflow button appear in the
bottom selection mode bar.

This commit makes press and hold in the view activate selection
mode. This behaviour is not triggered if the press and hold is
used to either start a rubberband selection or a drag operation
within a short time. The length of the short timeframe is defined
by a QStyleHint. This is currently not implemented in touch
because I can't test it.

Mix the selection mode bars' background colors using a nice
combination of colors from the current color scheme

BUG: 427202

1 files changed, 39 insertions, 11 deletions

diff --git a/src/views/dolphinviewactionhandler.cpp b/src/views/dolphinviewactionhandler.cpp
index f59daab42..a66d1f6dd 100644
--- a/src/views/dolphinviewactionhandler.cpp
+++ b/src/views/dolphinviewactionhandler.cpp
@@ -29,6 +29,8 @@
 #include <QMenu>
 #include <QPointer>
 
+#include <iostream>
+
 DolphinViewActionHandler::DolphinViewActionHandler(KActionCollection* collection, QObject* parent) :
     QObject(parent),
     m_actionCollection(collection),
@@ -72,6 +74,8 @@ void DolphinViewActionHandler::setCurrentView(DolphinView* view)
             this, &DolphinViewActionHandler::slotZoomLevelChanged);
     connect(view, &DolphinView::writeStateChanged,
             this, &DolphinViewActionHandler::slotWriteStateChanged);
+    connect(view, &DolphinView::selectionModeRequested,
+            this, [this]() { Q_EMIT setSelectionMode(true); });
     connect(view, &DolphinView::selectionChanged,
             this, &DolphinViewActionHandler::slotSelectionChanged);
     slotSelectionChanged(m_currentView->selectedItems());
@@ -415,7 +419,7 @@ QActionGroup* DolphinViewActionHandler::createFileItemRolesActionGroup(const QSt
 void DolphinViewActionHandler::slotViewModeActionTriggered(QAction* action)
 {
     const DolphinView::Mode mode = action->data().value<DolphinView::Mode>();
-    m_currentView->setMode(mode);
+    m_currentView->setViewMode(mode);
 
     QAction* viewModeMenu = m_actionCollection->action(QStringLiteral("view_mode"));
     viewModeMenu->setIcon(action->icon());
@@ -423,20 +427,34 @@ void DolphinViewActionHandler::slotViewModeActionTriggered(QAction* action)
 
 void DolphinViewActionHandler::slotRename()
 {
-    Q_EMIT actionBeingHandled();
-    m_currentView->renameSelectedItems();
+    if (m_currentView->selectedItemsCount() == 0) {
+        Q_EMIT setSelectionMode(true, SelectionModeBottomBar::Contents::RenameContents);
+    } else {
+        Q_EMIT actionBeingHandled();
+        m_currentView->renameSelectedItems();
+    }
 }
 
 void DolphinViewActionHandler::slotTrashActivated()
 {
-    Q_EMIT actionBeingHandled();
-    m_currentView->trashSelectedItems();
+    if (m_currentView->selectedItemsCount() == 0) {
+        Q_EMIT setSelectionMode(true, SelectionModeBottomBar::Contents::MoveToTrashContents);
+    } else {
+        Q_EMIT actionBeingHandled();
+        m_currentView->trashSelectedItems();
+        Q_EMIT setSelectionMode(false);
+    }
 }
 
 void DolphinViewActionHandler::slotDeleteItems()
 {
-    Q_EMIT actionBeingHandled();
-    m_currentView->deleteSelectedItems();
+    if (m_currentView->selectedItemsCount() == 0) {
+        Q_EMIT setSelectionMode(true, SelectionModeBottomBar::Contents::DeleteContents);
+    } else {
+        Q_EMIT actionBeingHandled();
+        m_currentView->deleteSelectedItems();
+        Q_EMIT setSelectionMode(false);
+    }
 }
 
 void DolphinViewActionHandler::togglePreview(bool show)
@@ -455,7 +473,7 @@ void DolphinViewActionHandler::slotPreviewsShownChanged(bool shown)
 
 QString DolphinViewActionHandler::currentViewModeActionName() const
 {
-    switch (m_currentView->mode()) {
+    switch (m_currentView->viewMode()) {
     case DolphinView::IconsView:
         return QStringLiteral("icons");
     case DolphinView::DetailsView:
@@ -735,8 +753,13 @@ void DolphinViewActionHandler::slotAdjustViewProperties()
 
 void DolphinViewActionHandler::slotDuplicate()
 {
-    Q_EMIT actionBeingHandled();
-    m_currentView->duplicateSelectedItems();
+    if (m_currentView->selectedItemsCount() == 0) {
+        Q_EMIT setSelectionMode(true, SelectionModeBottomBar::Contents::DuplicateContents);
+    } else {
+        Q_EMIT actionBeingHandled();
+        m_currentView->duplicateSelectedItems();
+        Q_EMIT setSelectionMode(false);
+    }
 }
 
 void DolphinViewActionHandler::slotProperties()
@@ -758,7 +781,12 @@ void DolphinViewActionHandler::slotProperties()
 
 void DolphinViewActionHandler::slotCopyPath()
 {
-    m_currentView->copyPathToClipboard();
+    if (m_currentView->selectedItemsCount() == 0) {
+        Q_EMIT setSelectionMode(true, SelectionModeBottomBar::Contents::CopyLocationContents);
+    } else {
+        m_currentView->copyPathToClipboard();
+        Q_EMIT setSelectionMode(false);
+    }
 }
 
 void DolphinViewActionHandler::slotSelectionChanged(const KFileItemList& selection)