Add button to fit image into current view

resources/kImageAnnotator_resources.qrc

@@ -48,6 +48,7 @@
         <file alias="italic.svg" >icons/dark/italic.svg</file>
         <file alias="underline.svg" >icons/dark/underline.svg</file>
         <file alias="cut.svg" >icons/dark/cut.svg</file>
+        <file alias="fitImage.svg" >icons/dark/fitImage.svg</file>
     </qresource>
 
     <qresource prefix="/icons/light">
@@ -98,6 +99,7 @@
         <file alias="italic.svg" >icons/light/italic.svg</file>
         <file alias="underline.svg" >icons/light/underline.svg</file>
         <file alias="cut.svg" >icons/light/cut.svg</file>
+        <file alias="fitImage.svg" >icons/light/fitImage.svg</file>
     </qresource>
 
     <qresource prefix="/stickers">

src/gui/annotator/settings/AnnotationGeneralSettings.cpp

@@ -45,6 +45,7 @@ void AnnotationGeneralSettings::initGui()
 	setFocusPolicy(Qt::ClickFocus);
 
 	connect(mZoomPicker, &ZoomPicker::zoomValueChanged, this, &AnnotationGeneralSettings::zoomValueChanged);
+	connect(mZoomPicker, &ZoomPicker::fitImageToViewSignal, this, &AnnotationGeneralSettings::zoomValueChanged);
 }
 
 void AnnotationGeneralSettings::updateZoomLevel(double value)

src/gui/scrollAndZoomView/ViewZoomer.cpp

@@ -64,8 +64,18 @@ void ViewZoomer::wheelZoom(QWheelEvent *event)
 	event->accept(); // supress scrolling
 }
 
+void ViewZoomer::fitImage()
+{
+	mView->fitInView(mView->sceneRect(), Qt::KeepAspectRatio);
+}
+
 void ViewZoomer::setZoomValue(double value)
 {
+	// ZoomPicker's mFitImageButton() sets value to -1
+	if (value < 0) {
+		fitImage();
+		return;
+	}
 	zoom(value - zoomValue());
 }
 

src/gui/scrollAndZoomView/ViewZoomer.h

@@ -42,6 +42,7 @@ class ViewZoomer : public ZoomValueProvider
 	void zoom(double factor);
 	void zoomToPoint(double factor, const QPoint &viewPoint);
 	void wheelZoom(QWheelEvent *event);
+	void fitImage();
 
 private:
 	QGraphicsView *mView;

src/widgets/settingsPicker/ZoomPicker.cpp

@@ -28,7 +28,8 @@ ZoomPicker::ZoomPicker(QWidget *parent) :
 	mSpinBox(new CustomSpinBox(this)),
 	mZoomInAction(new QAction(this)),
 	mZoomOutAction(new QAction(this)),
-	mResetZoomAction(new QAction(this))
+	mResetZoomAction(new QAction(this)),
+	mFitImageAction(new QAction(this))
 {
 	initGui();
 }
@@ -51,9 +52,14 @@ void ZoomPicker::initGui()
 	mSpinBox->setSuffix(QLatin1String("%"));
 	mSpinBox->setWrapping(false);
 
+	mFitImageAction = createAction(tr("Fit Image"), IconLoader::load(QLatin1String("fitImage.svg")));
+	connect(mFitImageAction, &QAction::triggered, this, &ZoomPicker::fitImageToView);
+	mFitImageButton = createButton(mFitImageAction);
+
 	mZoomInAction->setShortcut(QKeySequence::ZoomIn);
 	mZoomOutAction->setShortcut(QKeySequence::ZoomOut);
 	mResetZoomAction->setShortcut(Qt::CTRL + Qt::Key_0);
+	mFitImageAction->setShortcut(Qt::CTRL + Qt::Key_F);
 
 	setToolTip(getToolTip());
 
@@ -69,6 +75,7 @@ void ZoomPicker::initGui()
 
 	mLayout->addWidget(mLabel);
 	mLayout->addWidget(mSpinBox);
+	mLayout->addWidget(mFitImageButton);
 	mLayout->setAlignment(Qt::AlignLeft);
 
 	setLayout(mLayout);
@@ -80,7 +87,24 @@ QString ZoomPicker::getToolTip() const
 	auto zoomIn = tr("Zoom In (%1)").arg(mZoomInAction->shortcut().toString());
 	auto zoomOut = tr("Zoom Out (%1)").arg(mZoomOutAction->shortcut().toString());
 	auto resetZoom = tr("Reset Zoom (%1)").arg(mResetZoomAction->shortcut().toString());
-	return zoomIn + newLine + zoomOut + newLine + resetZoom;
+	auto fitZoom = tr("Fit image to view (%1)").arg(mFitImageAction->shortcut().toString());
+	return zoomIn + newLine + zoomOut + newLine + resetZoom + newLine + fitZoom;
+}
+
+QAction *ZoomPicker::createAction(const QString &tooltip, const QIcon &icon)
+{
+	auto action = new CustomToolButtonAction(this);
+	action->setIcon(icon);
+	action->setToolTip(tooltip);
+	action->updateDefaultWidget();
+	return action;
+}
+
+CustomToolButton *ZoomPicker::createButton(QAction *defaultAction)
+{
+	auto button = new CustomToolButton(this);
+	button->setAction(defaultAction);
+	return button;
 }
 
 void ZoomPicker::setZoomValue(double value)
@@ -89,6 +113,11 @@ void ZoomPicker::setZoomValue(double value)
 	mSpinBox->setValueSilent(zoomValue);
 }
 
+void ZoomPicker::fitImageToView()
+{
+	emit fitImageToViewSignal(-1);
+}
+
 void ZoomPicker::notifyZoomValueChanged(double value)
 {
 	emit zoomValueChanged(value / 100.0);

src/widgets/settingsPicker/ZoomPicker.h

@@ -23,12 +23,16 @@
 #include <QWidget>
 #include <QLabel>
 #include <QHBoxLayout>
+#include <QButtonGroup>
 #include <QAction>
 
 #include "src/widgets/CustomSpinBox.h"
+#include "src/widgets/CustomToolButton.h"
+#include "src/widgets/CustomToolButtonAction.h"
 #include "src/widgets/settingsPicker/SettingsPickerWidget.h"
 #include "src/common/helper/IconLoader.h"
 #include "src/common/provider/ScaledSizeProvider.h"
+#include "src/gui/scrollAndZoomView/ViewZoomer.h"
 
 namespace kImageAnnotator {
 
@@ -41,9 +45,11 @@ Q_OBJECT
 
 public slots:
 	void setZoomValue(double value);
+	void fitImageToView();
 
 signals:
 	void zoomValueChanged(double zoomLevel);
+	void fitImageToViewSignal(double value);
 
 protected:
 	QWidget* expandingWidget() override;
@@ -55,7 +61,10 @@ public slots:
 	QAction *mZoomInAction;
 	QAction *mZoomOutAction;
 	QAction *mResetZoomAction;
-
+	QAction *mFitImageAction;
+	CustomToolButton *mFitImageButton;
+	QAction *createAction(const QString &tooltip, const QIcon &icon);
+	CustomToolButton *createButton(QAction *defaultAction);
 	void initGui();
 
 private slots: