Referencia de la Clase FLImageViewer

#include <FLImageViewer.h>

Diagrama de herencias de FLImageViewer

Lista de todos los miembros.

Slots públicos
void	openFile ()
Métodos públicos
	FLImageViewer (QWidget *parent=0, const char *name=0, WFlags fl=0)
	~FLImageViewer ()
bool	loadImage (const QString &)
Métodos protegidos
void	paintEvent (QPaintEvent *)
void	resizeEvent (QResizeEvent *)
void	mousePressEvent (QMouseEvent *)
void	mouseReleaseEvent (QMouseEvent *)
void	mouseMoveEvent (QMouseEvent *)
Amigas
class	FLImageViewerInterface

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Documentación del constructor y destructor

FLImageViewer::FLImageViewer	(	QWidget *	parent = 0,
		const char *	name = 0,
		WFlags	fl = 0
	)

FLImageViewer::~FLImageViewer

(

)

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Documentación de las funciones miembro

bool FLImageViewer::loadImage

(

const QString &

fileName

)

void FLImageViewer::mouseMoveEvent

(

QMouseEvent *

e

)

[protected, virtual]

This event handler, for event e, can be reimplemented in a subclass to receive mouse move events for the widget.

If mouse tracking is switched off, mouse move events only occur if a mouse button is pressed while the mouse is being moved. If mouse tracking is switched on, mouse move events occur even if no mouse button is pressed.

QMouseEvent::pos() reports the position of the mouse cursor, relative to this widget. For press and release events, the position is usually the same as the position of the last mouse move event, but it might be different if the user's hand shakes. This is a feature of the underlying window system, not Qt.

Ver también:

setMouseTracking(), mousePressEvent(), mouseReleaseEvent(), mouseDoubleClickEvent(), event(), QMouseEvent

Reimplementado de QWidget.

void FLImageViewer::mousePressEvent

(

QMouseEvent *

e

)

[protected, virtual]

This event handler, for event e, can be reimplemented in a subclass to receive mouse press events for the widget.

If you create new widgets in the mousePressEvent() the mouseReleaseEvent() may not end up where you expect, depending on the underlying window system (or X11 window manager), the widgets' location and maybe more.

The default implementation implements the closing of popup widgets when you click outside the window. For other widget types it does nothing.

Ver también:

mouseReleaseEvent(), mouseDoubleClickEvent(), mouseMoveEvent(), event(), QMouseEvent

Reimplementado de QWidget.

void FLImageViewer::mouseReleaseEvent

(

QMouseEvent *

e

)

[protected, virtual]

This event handler, for event e, can be reimplemented in a subclass to receive mouse release events for the widget.

Ver también:

mouseReleaseEvent(), mouseDoubleClickEvent(), mouseMoveEvent(), event(), QMouseEvent

Reimplementado de QWidget.

void FLImageViewer::openFile

(

)

[slot]

void FLImageViewer::paintEvent

(

QPaintEvent *

)

[protected, virtual]

This event handler can be reimplemented in a subclass to receive paint events.

A paint event is a request to repaint all or part of the widget. It can happen as a result of repaint() or update(), or because the widget was obscured and has now been uncovered, or for many other reasons.

Many widgets can simply repaint their entire surface when asked to, but some slow widgets need to optimize by painting only the requested region: QPaintEvent::region(). This speed optimization does not change the result, as painting is clipped to that region during event processing. QListView and QCanvas do this, for example.

Qt also tries to speed up painting by merging multiple paint events into one. When update() is called several times or the window system sends several paint events, Qt merges these events into one event with a larger region (see QRegion::unite()). repaint() does not permit this optimization, so we suggest using update() when possible.

When the paint event occurs, the update region has normally been erased, so that you're painting on the widget's background. There are a couple of exceptions and QPaintEvent::erased() tells you whether the widget has been erased or not.

The background can be set using setBackgroundMode(), setPaletteBackgroundColor() or setBackgroundPixmap(). The documentation for setBackgroundMode() elaborates on the background; we recommend reading it.

Ver también:

event(), repaint(), update(), QPainter, QPixmap, QPaintEvent

Reimplementado de QWidget.

void FLImageViewer::resizeEvent

(

QResizeEvent *

)

[protected, virtual]

This event handler can be reimplemented in a subclass to receive widget resize events. When resizeEvent() is called, the widget already has its new geometry. The old size is accessible through QResizeEvent::oldSize().

The widget will be erased and receive a paint event immediately after processing the resize event. No drawing need be (or should be) done inside this handler.

Widgets that have been created with the WNoAutoErase flag will not be erased. Nevertheless, they will receive a paint event for their entire area afterwards. Again, no drawing needs to be done inside this handler.

The default implementation calls updateMask() if the widget has automatic masking enabled.

Ver también:

moveEvent(), event(), resize(), QResizeEvent, paintEvent()

Reimplementado de QWidget.

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Documentación de las funciones relacionadas y clases amigas

friend class FLImageViewerInterface [friend]

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La documentación para esta clase fue generada a partir de los siguientes ficheros:

• src/flbase/FLImageViewer.h
• src/flbase/FLImageViewer.cpp