Code refactor

More flexible tool API
Minor code format fixes
Clipboard freeze fixed(?)
Arrow correcly growing close to the start point
Improve maintainability
Add undo/redo stack

src/tools/selection/selectiontool.cpp

@@ -0,0 +1,75 @@
+// Copyright(c) 2017-2018 Alejandro Sirgo Rica & Contributors
+//
+// This file is part of Flameshot.
+//
+//     Flameshot is free software: you can redistribute it and/or modify
+//     it under the terms of the GNU General Public License as published by
+//     the Free Software Foundation, either version 3 of the License, or
+//     (at your option) any later version.
+//
+//     Flameshot is distributed in the hope that it will be useful,
+//     but WITHOUT ANY WARRANTY; without even the implied warranty of
+//     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//     GNU General Public License for more details.
+//
+//     You should have received a copy of the GNU General Public License
+//     along with Flameshot.  If not, see <http://www.gnu.org/licenses/>.
+
+#include "selectiontool.h"
+#include <QPainter>
+
+namespace {
+#define PADDING_VALUE 2
+}
+
+SelectionTool::SelectionTool(QObject *parent) : AbstractTwoPointTool(parent) {
+
+}
+
+bool SelectionTool::closeOnButtonPressed() const {
+    return false;
+}
+
+QIcon SelectionTool::icon(const QColor &background, bool inEditor) const {
+    Q_UNUSED(inEditor);
+    return QIcon(iconPath(background) + "square-outline.png");
+}
+QString SelectionTool::name() const {
+    return tr("Rectangular Selection");
+}
+
+QString SelectionTool::nameID() {
+    return "";
+}
+
+QString SelectionTool::description() const {
+    return tr("Sets the Selection as the paint tool");
+}
+
+CaptureTool* SelectionTool::copy(QObject *parent) {
+    return new SelectionTool(parent);
+}
+
+void SelectionTool::process(QPainter &painter, const QPixmap &pixmap, bool recordUndo) {
+    if (recordUndo) {
+        updateBackup(pixmap);
+    }
+    painter.setPen(QPen(m_color, m_thickness));
+    painter.drawRect(QRect(m_points.first, m_points.second));
+}
+
+void SelectionTool::paintMousePreview(QPainter &painter, const CaptureContext &context) {
+    painter.setPen(QPen(context.color, PADDING_VALUE + context.thickness));
+    painter.drawLine(context.mousePos, context.mousePos);
+}
+
+void SelectionTool::drawStart(const CaptureContext &context) {
+    m_color = context.color;
+    m_thickness = context.thickness + PADDING_VALUE;
+    m_points.first = context.mousePos;
+    m_points.second = context.mousePos;
+}
+
+void SelectionTool::pressed(const CaptureContext &context) {
+    Q_UNUSED(context);
+}