QgsMapOverviewCanvas class

A widget that displays an overview map.

Public functions

auto layers() const -> QList<QgsMapLayer*>: Returns list of layers visible in the overview.
void refresh(): renders overview and updates panning widget
void setBackgroundColor(const QColor& color): changes background color
void setLayers(const QList<QgsMapLayer*>& layers): updates layer set for overview

void destinationCrsChanged(): Should be called when the canvas destination CRS is changed.
void drawExtentRect(): used for overview canvas to reflect changed extent in main map canvas
void mouseMoveEvent(QMouseEvent* e) override: Overridden mouse move event.
void mousePressEvent(QMouseEvent* e) override: Overridden mouse press event.
void mouseReleaseEvent(QMouseEvent* e) override: Overridden mouse release event.
void paintEvent(QPaintEvent* pe) override: Overridden paint event.
void resizeEvent(QResizeEvent* e) override: Overridden resize event.
void showEvent(QShowEvent* e) override: Overridden show event.
void transformContextChanged(): Called when the canvas transform context is changed.
void updatePanningWidget(QPoint pos): called when panning to reflect mouse movement

void layerRepaintRequested(bool deferred = false): Triggered when a layer in the overview requests a repaint.

QgsMapRendererQImageJob* mJob: for rendering overview
QgsMapCanvas* mMapCanvas: main map canvas - used to get/set extent
QPoint mPanningCursorOffset: position of cursor inside panning widget
QgsPanningWidget* mPanningWidget: widget for panning map in overview
QPixmap mPixmap: pixmap where the map is stored
QgsMapSettings mSettings: map settings used for rendering of the overview map