QmitkCrossWidget Class Reference

A crosshair label widget that reports mouse drag deltas. More...

#include <QmitkCrossWidget.h>

Inheritance diagram for QmitkCrossWidget:

Collaboration diagram for QmitkCrossWidget:

Signals
void	SignalDeltaMove (int deltaX, int deltaY)
	Emitted during mouse drag with the delta movement. More...

Public Member Functions
	QmitkCrossWidget (QWidget *parent=nullptr, Qt::WindowFlags f={})
	Construct the cross widget. More...
void	mousePressEvent (QMouseEvent *mouseEvent) override
	Handle mouse press: record initial position and emit zero delta. More...
void	mouseMoveEvent (QMouseEvent *mouseEvent) override
	Handle mouse move: compute delta from last position and emit it. More...
void	mouseReleaseEvent (QMouseEvent *mouseEvent) override
	Handle mouse release (no-op). More...

Protected Member Functions
void	ResetMousePosition (int xpos, int ypos)

Protected Attributes
int	lastX
int	lastY

Detailed Description

A crosshair label widget that reports mouse drag deltas.

Captures mouse press, move, and release events and emits the relative pixel movement (delta) as a signal. During mouse drag, the cursor position is reset to the press location (except on macOS) so the widget acts as an infinite drag surface.

See also

QmitkTransferFunctionGeneratorWidget

Definition at line 31 of file QmitkCrossWidget.h.

Constructor & Destructor Documentation

QmitkCrossWidget()

QmitkCrossWidget::QmitkCrossWidget	(	QWidget *	parent = nullptr,
		Qt::WindowFlags	f = {}
	)

Construct the cross widget.

Parameters

[in]	parent	The parent widget.
[in]	f	Window flags.

Member Function Documentation

mouseMoveEvent()

void QmitkCrossWidget::mouseMoveEvent ( QMouseEvent *  mouseEvent )

override

Handle mouse move: compute delta from last position and emit it.

mousePressEvent()

void QmitkCrossWidget::mousePressEvent ( QMouseEvent *  mouseEvent )

override

Handle mouse press: record initial position and emit zero delta.

mouseReleaseEvent()

void QmitkCrossWidget::mouseReleaseEvent ( QMouseEvent *  mouseEvent )

override

Handle mouse release (no-op).

ResetMousePosition()

void QmitkCrossWidget::ResetMousePosition ( int  xpos, int  ypos  )

inlineprotected

Definition at line 65 of file QmitkCrossWidget.h.

SignalDeltaMove

void QmitkCrossWidget::SignalDeltaMove ( int  deltaX, int  deltaY  )

signal

Emitted during mouse drag with the delta movement.

Parameters

[in]	deltaX	Horizontal pixel delta.
[in]	deltaY	Vertical pixel delta.

Member Data Documentation

lastX

int QmitkCrossWidget::lastX

protected

Definition at line 68 of file QmitkCrossWidget.h.

lastY

int QmitkCrossWidget::lastY

protected

Definition at line 68 of file QmitkCrossWidget.h.

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The documentation for this class was generated from the following file:

• QmitkCrossWidget.h