GUI: Begin basic drag/drop between buttons: Allow swapping places

Issue: #7

entrypushbutton.cpp

@@ -13,6 +13,10 @@
  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
+
+#include <QDrag>
+#include <QMimeData>
+#include <QApplication>
 #include "entrypushbutton.h"
 
 EntryPushButton::EntryPushButton(const EntryConfig &config) : QPushButton()
@@ -37,9 +41,6 @@ EntryPushButton::EntryPushButton(const EntryConfig &config) : QPushButton()
 	connect(this, SIGNAL(clicked()), this, SLOT(emitOwnClicked()));
 }
 
-
-
-
 void EntryPushButton::emitOwnClicked()
 {
 	emit clicked(this->config);
@@ -65,12 +66,67 @@ void EntryPushButton::showName()
 	this->setText(this->config.name);
 }
 
-int EntryPushButton::getRow() const { return config.row; }
-int EntryPushButton::getCol() const { return config.col; }
-QString EntryPushButton::getName() const { return config.name; }
-QString EntryPushButton::getShortcutKey() const { return config.key; }
-void EntryPushButton::setShortcutKey(QString key) { this->config.key = key; }
-void EntryPushButton::setRow(int row) { this->config.row = row; }
-void EntryPushButton::setCol(int col) { this->config.col = col; }
-QStringList EntryPushButton::getArguments() const { return this->config.arguments; }
-QString EntryPushButton::getCommand() const { return this->config.command; }
+void EntryPushButton::mousePressEvent(QMouseEvent *event)
+{
+	if(event->button() == Qt::LeftButton)
+	{
+		dragStartPosition = event->pos();
+	}
+	return QPushButton::mousePressEvent(event);
+}
+
+void EntryPushButton::mouseMoveEvent(QMouseEvent *event)
+{
+	if(!(event->buttons() & Qt::LeftButton))
+	{
+		return;
+	}
+	if((event->pos() - dragStartPosition).manhattanLength() < QApplication::startDragDistance())
+	{
+		return;
+	}
+
+	QDrag *drag = new QDrag(this);
+	QMimeData *mimeData = new QMimeData();
+	QByteArray data;
+	mimeData->setData(ENTRYBUTTON_MIME_TYPE_STR, data);
+	drag->setMimeData(mimeData);
+	Qt::DropAction dropAction = drag->exec(Qt::MoveAction);
+}
+
+int EntryPushButton::getRow() const
+{
+	return config.row;
+}
+int EntryPushButton::getCol() const
+{
+	return config.col;
+}
+QString EntryPushButton::getName() const
+{
+	return config.name;
+}
+QString EntryPushButton::getShortcutKey() const
+{
+	return config.key;
+}
+void EntryPushButton::setShortcutKey(QString key)
+{
+	this->config.key = key;
+}
+void EntryPushButton::setRow(int row)
+{
+	this->config.row = row;
+}
+void EntryPushButton::setCol(int col)
+{
+	this->config.col = col;
+}
+QStringList EntryPushButton::getArguments() const
+{
+	return this->config.arguments;
+}
+QString EntryPushButton::getCommand() const
+{
+	return this->config.command;
+}

entrypushbutton.h

@@ -18,17 +18,28 @@
 
 #include <QWidget>
 #include <QPushButton>
+#include <QMouseEvent>
 #include "entryprovider.h"
+
+#define ENTRYBUTTON_MIME_TYPE_STR "application/x-qsrun-entrypushbutton"
+
 class EntryPushButton : public QPushButton
 {
 	Q_OBJECT
   private:
 	EntryConfig config;
+	QPoint dragStartPosition;
+
   private slots:
 	void emitOwnClicked();
 
   signals:
 	void clicked(const EntryConfig &config);
+
+  protected:
+	void mousePressEvent(QMouseEvent *event);
+	void mouseMoveEvent(QMouseEvent *event);
+
   public:
 	EntryPushButton(const EntryConfig &config);
 	const EntryConfig &getEntryConfig();
@@ -46,6 +57,4 @@ public:
 	void setShortcutKey(QString key);
 };
 
-
-
 #endif // ENTRYPUSHBUTTON_H

window.cpp

@@ -37,6 +37,7 @@ Window::Window(EntryProvider &entryProvider, SettingsProvider &configProvider)
 	createGui();
 	initFromConfig();
 	this->lineEdit->installEventFilter(this);
+	this->setAcceptDrops(true);
 	QFont font;
 	font.setPointSize(48);
 	font.setBold(true);
@@ -405,3 +406,38 @@ void Window::focusInput()
 {
 	this->lineEdit->setFocus();
 }
+
+void Window::dragEnterEvent(QDragEnterEvent *event)
+{
+	if(event->mimeData()->hasFormat(ENTRYBUTTON_MIME_TYPE_STR))
+	{
+		event->acceptProposedAction();
+	}
+}
+
+void Window::dropEvent(QDropEvent *event)
+{
+	int count = grid->count();
+	for(int i = 0; i < count; i++)
+	{
+		QLayoutItem *current = grid->itemAt(i);
+		if(current->geometry().contains(event->pos()))
+		{
+			EntryPushButton *buttonAtDrop = (EntryPushButton *)current->widget();
+			EntryPushButton *buttonAtSource = (EntryPushButton *)event->source();
+
+			int tmp_row = buttonAtSource->getRow();
+			int tmp_col = buttonAtSource->getCol();
+
+			grid->addWidget(buttonAtSource, buttonAtDrop->getRow(), buttonAtDrop->getCol());
+			buttonAtSource->setRow(buttonAtDrop->getRow());
+			buttonAtSource->setCol(buttonAtDrop->getCol());
+
+			grid->addWidget(buttonAtDrop, tmp_row, tmp_col);
+			buttonAtDrop->setRow(tmp_row);
+			buttonAtDrop->setCol(tmp_col);
+			break;
+		}
+	}
+	event->acceptProposedAction();
+}

window.h

@@ -30,6 +30,9 @@
 #include <QThread>
 #include <QTreeWidget>
 #include <QLabel>
+#include <QMimeData>
+#include <QDebug>
+#include <QRect>
 #include "entrypushbutton.h"
 #include "calculationengine.h"
 #include "settingsprovider.h"
@@ -37,6 +40,10 @@
 class Window : public QWidget
 {
 	Q_OBJECT
+  protected:
+	void dragEnterEvent(QDragEnterEvent *event);
+	void dropEvent(QDropEvent *event);
+
   private:
 	EntryProvider *entryProvider;
 	SettingsProvider *settingsProvider;
@@ -70,13 +77,13 @@ private:
   private slots:
 	void lineEditReturnPressed();
 	void showCalculationResultContextMenu(const QPoint &point);
+
   public:
 	Window(EntryProvider &entryProvider, SettingsProvider &settingsProvider);
 	void setSystemConfig(const QVector<EntryConfig> &config);
 	bool eventFilter(QObject *obj, QEvent *event);
 	void focusInput();
 	~Window();
-
 };
 
 #endif