GUI: Allow deleting video files with the Delete key

Makefile.am

@@ -17,6 +17,7 @@ moc_%.cpp : %.h
 bin_PROGRAMS = d2vwitch
 
 moc_files = src/moc_GUIWindow.cpp \
+			src/moc_ListWidget.cpp \
 			src/moc_ScrollArea.cpp
 
 MOSTLYCLEANFILES = $(moc_files)
@@ -34,6 +35,8 @@ d2vwitch_SOURCES = src/Bullshit.cpp \
 				   src/FFMPEG.h \
 				   src/GUIWindow.cpp \
 				   src/GUIWindow.h \
+				   src/ListWidget.cpp \
+				   src/ListWidget.h \
 				   src/MPEGParser.cpp \
 				   src/MPEGParser.h \
 				   src/ScrollArea.cpp \

src/GUIWindow.cpp

@@ -410,7 +410,7 @@ GUIWindow::GUIWindow(QWidget *parent)
     setWindowTitle("D2V Witch v" PACKAGE_VERSION);
 
 
-    input_list = new QListWidget(this);
+    input_list = new ListWidget(this);
     input_list->setSelectionMode(QAbstractItemView::ExtendedSelection);
     QPushButton *add_button = new QPushButton("&Add files", this);
     QPushButton *remove_button = new QPushButton("&Remove files", this);
@@ -472,6 +472,8 @@ GUIWindow::GUIWindow(QWidget *parent)
     container_widget = new QStackedWidget(this);
 
 
+    connect(input_list, &ListWidget::deletePressed, remove_button, &QPushButton::click);
+
     connect(add_button, &QPushButton::clicked, [this] () {
         QStringList file_names = QFileDialog::getOpenFileNames(this, "Open video files", "", "", nullptr, QFileDialog::DontUseNativeDialog);
 

src/GUIWindow.h

@@ -28,6 +28,7 @@ SOFTWARE.
 #include "D2V.h"
 #include "FakeFile.h"
 #include "FFMPEG.h"
+#include "ListWidget.h"
 
 
 class GUIWindow : public QMainWindow {
@@ -61,7 +62,7 @@ class GUIWindow : public QMainWindow {
 
     // Widgets
 
-    QListWidget *input_list;
+    ListWidget *input_list;
     QLineEdit *d2v_edit;
     QListWidget *video_list;
     QButtonGroup *video_group;

src/ListWidget.cpp

@@ -0,0 +1,47 @@
+/*
+
+Copyright (c) 2015, John Smith
+
+Permission to use, copy, modify, and/or distribute this software for
+any purpose with or without fee is hereby granted, provided that the
+above copyright notice and this permission notice appear in all copies.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
+WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR
+BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES
+OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
+WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
+ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
+SOFTWARE.
+
+*/
+
+
+#include <QKeyEvent>
+
+#include "ListWidget.h"
+
+void ListWidget::keyPressEvent(QKeyEvent *event) {
+    auto mod = event->modifiers();
+    int key = event->key();
+
+    if (mod == Qt::NoModifier && key == Qt::Key_Delete) {
+        emit deletePressed();
+        return;
+    }
+
+    QListWidget::keyPressEvent(event);
+}
+
+
+QList<QListWidgetItem *> ListWidget::selectedItems() const {
+    auto selection = QListWidget::selectedItems();
+
+    auto cmp = [this] (const QListWidgetItem *a, const QListWidgetItem *b) -> bool {
+        return row(a) < row(b);
+    };
+    std::sort(selection.begin(), selection.end(), cmp);
+
+    return selection;
+}

src/ListWidget.h

@@ -0,0 +1,41 @@
+/*
+
+Copyright (c) 2015, John Smith
+
+Permission to use, copy, modify, and/or distribute this software for
+any purpose with or without fee is hereby granted, provided that the
+above copyright notice and this permission notice appear in all copies.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
+WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR
+BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES
+OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
+WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
+ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
+SOFTWARE.
+
+*/
+
+
+#ifndef D2V_WITCH_LISTWIDGET_H
+#define D2V_WITCH_LISTWIDGET_H
+
+#include <QListWidget>
+
+class ListWidget : public QListWidget {
+    Q_OBJECT
+
+signals:
+    void deletePressed();
+
+private:
+    void keyPressEvent(QKeyEvent *event);
+
+public:
+    using QListWidget::QListWidget;
+
+    QList<QListWidgetItem *> selectedItems() const;
+};
+
+#endif // D2V_WITCH_LISTWIDGET_H