The QFrame class is the base class of widgets that have an (optional) frame. More...
#include <qframe.h>
Inherits QWidget.
Inherited by QGroupBox, QLCDNumber, QLabel, QMenuBar, QProgressBar, QScrollView, QSpinBox, QSplitter, QTableView and QWidgetStack.
It draws a label and calls a virtual function, drawContents(), to fill in the frame. This function is reimplemented by essentially all subclasses. There are also two other less useful functions, drawFrame() and frameChanged().
QMenuBar uses this to "raise" the menu bar above the surrounding screen:
if ( style() == MotifStyle ) {
setFrameStyle( QFrame::Panel | QFrame::Raised );
setLineWidth( 2 );
} else {
setFrameStyle( QFrame::NoFrame );
}
The QFrame class can also be used directly for creating simple frames without any contents, for example like this:
QFrame *emptyFrame = new QFrame( parentWidget );
emptyFrame->setFrameStyle( Panel | Sunken );
emptyFrame->setLineWidth( 2 );
A frame widget has three attributes: frame style, a line width and a mid-line width.
The frame style is specified by a frame shape and a shadow style.
The frame shapes are NoFrame, Box, Panel, WinPanel, HLine and VLine, and the shadow styles are Plain, Raised
and Sunken.
The line width is the width of the frame border.
The mid-line width specifies the width of an extra line in the
middle of the frame, that uses a third color to obtain a special 3D
effect. Notice that a mid-line is only drawn for Box, HLine
and VLine frames that are raised or sunken.
This table shows the most useful combinations of styles and widths (and some rather useless ones):
For obvious reasons, NoFrame isn't shown. The gray areas next to
the VLine and HLine examples are there because the widgets are
taller/wider than the natural width of the lines. frameWidth()
returns the natural width of the line.
The labels on the top and right are QLabel objects with frameStyle()
Raised|Panel and lineWidth() 1.
Examples: tictac/tictac.cpp life/life.cpp movies/main.cpp xform/xform.cpp widgets/widgets.cpp
Constructs a frame widget with frame style NoFrame and a 1 pixel frame
width.
The allowLines argument can be set to FALSE to disallow HLine and
VLine shapes.
The parent, name and f arguments are passed to the QWidget constructor.
Returns the rectangle inside the frame.
See also: frameRect() and drawContents().
[virtual protected]Virtual function that draws the contents of the frame.
The QPainter is already open when you get it, and you must leave it open. Painter transformations are switched off on entry. If you transform the painter, remember to take the frame into account and reset transformation before returning.
This function is reimplemented by subclasses that draw something inside the frame. It should draw only inside contentsRect(). The default function does nothing.
See also: contentsRect() and QPainter::setClipRect().
Reimplemented in QLCDNumber, QMenuBar, QLabel and QProgressBar.
[virtual protected]Draws the frame using the current frame attributes and color group. The rectangle inside the frame is not affected.
This function is virtual, but in general you do not need to reimplement it. If you do, note that the QPainter is already open and must remain open.
See also: frameRect(), contentsRect(), drawContents(), frameStyle() and setPalette().
Examples: life/life.cpp
[virtual protected]Virtual function that is called when the frame style, line width or mid-line width changes.
This function can be reimplemented by subclasses that need to know when the frame attributes change.
Reimplemented in QScrollView and QWidgetStack.
Returns the frame rectangle.
The default frame rectangle is equivalent to the widget rectangle.
See also: setFrameRect().
Returns the frame shadow value from the frame style.
See also: frameStyle() and frameShape().
Returns the frame shape value from the frame style.
See also: frameStyle() and frameShadow().
Returns the frame style.
The default value is QFrame::NoFrame.
See also: setFrameStyle(), frameShape() and frameShadow().
Returns the width of the frame that is drawn.
Note that the frame width depends on the frame
style, not only the line width and the mid line width. For
example, the style NoFrame always has a frame width 0, while the
style Panel has a frame width equivalent to the line width.
See also: lineWidth(), midLineWidth() and frameStyle().
Examples: widgets/widgets.cpp
Returns TRUE if line shapes (HLine or VLine) are allowed, or FALSE if
they are not allowed.
It is only possible to disallow line shapes in the constructor. The default value is TRUE.
Returns the line width. (Note that the total line width
for HLine and VLine is given by frameWidth(), not
lineWidth().)
The default value is 1.
See also: setLineWidth(), midLineWidth() and frameWidth().
Returns the width of the margin. The margin is the distance between the innermost pixel of the frame and the outermost pixel of contentsRect(). It is included in frameWidth().
The margin is filled according to backgroundMode().
The default value is 0.
See also: setMargin(), lineWidth() and frameWidth().
Returns the width of the mid-line.
The default value is 0.
See also: setMidLineWidth(), lineWidth() and frameWidth().
[virtual protected]Handles paint events for the frame.
Paints the frame and the contents.
Opens the painter on the frame and calls first drawFrame(), then drawContents().
Reimplemented from QWidget.
[virtual protected]Handles resize events for the frame.
Adjusts the frame rectangle for the resized widget. The frame rectangle is elastic, the surrounding area is static.
The resulting frame rectangle may be null or invalid. You can use setMinimumSize() to avoid that possibility.
Nothing is done if the frame rectangle is a null rectangle already.
Reimplemented from QWidget.
[protected]Sets the frame rectangle to r.
The frame rectangle is the rectangle the frame is drawn in. By default, this is the entire widget. Calling setFrameRect() does not cause a widget update.
If r is a null rectangle (for example
QRect(0,0,0,0)), then the frame rectangle is equivalent
to the widget rectangle.
See also: frameRect() and contentsRect().
Sets the frame style to style.
The style is the bitwise OR between a frame shape and a frame shadow style. See the illustration in the class documentation.
The frame shapes are:
NoFrame draws nothing. Naturally, you should not specify a shadow
style if you use this.
Box draws a rectangular box. The contents appear to be
level with the surrounding screen, but the border itself may be
raised or sunken.
Panel draws a rectangular panel that can be raised or sunken.
WinPanel draws a rectangular panel that can be raised or sunken.
Specifying this shape sets the line width to 2 pixels. WinPanel provides
fancy Windows 95-like shadows.
HLine draws a horizontal line (vertically centered).
VLine draws a vertical line (horizontally centered).
The shadow styles are:
Plain draws using the palette foreground color (without any
3D effect).
Raised draws a 3D raised line using the light and dark
colors of the current color group.
Sunken draws a 3D sunken line using the light and dark
colors of the current color group.
If a mid-line width greater than 0 is specified, an additional line
is drawn for Raised or Sunken Box, HLine and VLine
frames. The mid color of the current color group is used for
drawing middle lines.
Warning: Attempts to set the frame style to HLine or VLine
(with any shadow style) are disregarded unless line shapes are
allowed. Line shapes are allowed by default.
See also: Illustration, frameStyle(), lineShapesOk(), colorGroup() and QColorGroup.
Examples: tictac/tictac.cpp dclock/dclock.cpp xform/xform.cpp cursor/cursor.cpp layout/layout.cpp widgets/widgets.cpp
Sets the line width to w.
See also: frameWidth(), lineWidth() and setMidLineWidth().
Examples: dclock/dclock.cpp xform/xform.cpp
Sets the width of the margin to w.
See also: margin() and setLineWidth().
Sets the width of the mid-line to w.
See also: midLineWidth() and setLineWidth().
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