qwtsliderbase.3

linux下qt的第三方的一个类

.TH "QwtSliderBase" 3 "16 Nov 2004" "Version 4.2.0" "Qwt User's Guide" \" -*- nroff -*-
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.SH NAME
QwtSliderBase \- 
.SH SYNOPSIS
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.PP
Inherits \fBQwtDblRange\fP.
.PP
Inherited by \fBQwtDial\fP, \fBQwtKnob\fP, \fBQwtSlider\fP, and \fBQwtWheel\fP.
.PP
.SH "Detailed Description"
.PP 
A Base class for sliders. 

QwtSliderBase is a base class for slider widgets. QwtSliderBase handles the mouse events and updates the slider's value accordingly. Derived classes only have to implement the \fBgetValue()\fP and \fBgetScrollMode()\fP members, and should react to a \fBvalueChange()\fP, which normally requires repainting. 
.PP
Definition at line 30 of file qwt_sldbase.h.
.SS "Public Types"

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.RI "enum \fBScrollMode\fP { \fBScrNone\fP, \fBScrMouse\fP, \fBScrTimer\fP, \fBScrDirect\fP, \fBScrPage\fP }"
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.SS "Public Slots"

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.RI "virtual void \fBsetValue\fP (double val)"
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.RI "virtual void \fBfitValue\fP (double val)"
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.RI "virtual void \fBincValue\fP (int steps)"
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.RI "virtual void \fBsetReadOnly\fP (bool)"
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.SS "Signals"

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.RI "void \fBvalueChanged\fP (double value)"
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.RI "void \fBsliderPressed\fP ()"
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.RI "void \fBsliderReleased\fP ()"
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.RI "void \fBsliderMoved\fP (double value)"
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.SS "Public Member Functions"

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.RI "\fBQwtSliderBase\fP (Qt::Orientation orientation, QWidget *parent=0, const char *name=0, Qt::WFlags flags=0)"
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.RI "virtual \fB~QwtSliderBase\fP ()"
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.RI "void \fBsetUpdateTime\fP (int t)"
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.RI "void \fBstopMoving\fP ()"
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.RI "void \fBsetTracking\fP (bool enable)"
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.RI "virtual void \fBsetMass\fP (double val)"
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.RI "virtual double \fBmass\fP () const"
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.RI "virtual void \fBsetOrientation\fP (Orientation o)"
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.RI "Orientation \fBorientation\fP () const"
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.RI "bool \fBisReadOnly\fP () const"
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.RI "bool \fBisValid\fP () const"
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.RI "void \fBsetValid\fP (bool valid)"
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.SS "Protected Member Functions"

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.RI "void \fBsetPosition\fP (const QPoint &p)"
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.RI "virtual void \fBvalueChange\fP ()"
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.RI "virtual void \fBtimerEvent\fP (QTimerEvent *e)"
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.RI "virtual void \fBmousePressEvent\fP (QMouseEvent *e)"
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.RI "virtual void \fBmouseReleaseEvent\fP (QMouseEvent *e)"
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.RI "virtual void \fBmouseMoveEvent\fP (QMouseEvent *e)"
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.RI "virtual void \fBkeyPressEvent\fP (QKeyEvent *e)"
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.RI "virtual void \fBwheelEvent\fP (QWheelEvent *e)"
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.RI "virtual double \fBgetValue\fP (const QPoint &p)=0"
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.RI "virtual void \fBgetScrollMode\fP (const QPoint &p, int &scrollMode, int &direction)=0"
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.SS "Protected Attributes"

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.RI "int \fBd_scrollMode\fP"
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.RI "double \fBd_mouseOffset\fP"
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.RI "int \fBd_direction\fP"
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.RI "int \fBd_tracking\fP"
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.SH "Constructor & Destructor Documentation"
.PP 
.SS "QwtSliderBase::QwtSliderBase (Qt::Orientation orientation, QWidget * parent = \fC0\fP, const char * name = \fC0\fP, Qt::WFlags flags = \fC0\fP)"
.PP
Constructor. 
.PP
Definition at line 19 of file qwt_sldbase.cpp.
.PP
References QwtDblRange::setRange(), and setValue().
.SS "QwtSliderBase::~\fBQwtSliderBase\fP ()\fC [virtual]\fP"
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Destructor. 
.PP
Definition at line 38 of file qwt_sldbase.cpp.
.SH "Member Function Documentation"
.PP 
.SS "void QwtSliderBase::fitValue (double val)\fC [virtual, slot]\fP"
.PP
Set the slider's value to the nearest integer multiple of the step size. 
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\fBSee also:\fP
.RS 4
\fBQwtSliderBase::setValue()\fP 
.RE
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.PP
Reimplemented from \fBQwtDblRange\fP.
.PP
Definition at line 519 of file qwt_sldbase.cpp.
.PP
References QwtDblRange::fitValue(), and stopMoving().
.SS "virtual void QwtSliderBase::getScrollMode (const QPoint & p, int & scrollMode, int & direction)\fC [protected, pure virtual]\fP"
.PP
Determine what to do when the user presses a mouse button. 
.PP
This function is abstract and has to be implemented by derived classes. It is called on a mousePress event. The derived class can determine what should happen next in dependence of the position where the mouse was pressed by returning scrolling mode and direction. QwtSliderBase knows the following modes:
.IP "\fBQwtSliderBase::ScrNone \fP" 1c
Scrolling switched off. Don't change the value. 
.IP "\fBQwtSliderBase::ScrMouse \fP" 1c
Change the value while the user keeps the button pressed and moves the mouse. 
.IP "\fBQwtSliderBase::ScrTimer \fP" 1c
Automatic scrolling. Increment the value in the specified direction as long as the user keeps the button pressed. 
.IP "\fBQwtSliderBase::ScrPage \fP" 1c
Automatic scrolling. Same as ScrTimer, but increment by page size.
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.PP
\fBParameters:\fP
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\fIp\fP point where the mouse was pressed 
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\fBReturn values:\fP
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\fIscrollMode\fP The scrolling mode 
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\fIdirection\fP direction: 1, 0, or -1. 
.RE
.PP

.PP
Implemented in \fBQwtDial\fP, \fBQwtSlider\fP, and \fBQwtWheel\fP.
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Referenced by mousePressEvent(), and wheelEvent().
.SS "virtual double QwtSliderBase::getValue (const QPoint & p)\fC [protected, pure virtual]\fP"
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Determine the value corresponding to a specified poind. 
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This is an abstract virtual function which is called when the user presses or releases a mouse button or moves the mouse. It has to be implemented by the derived class. 
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\fBParameters:\fP
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\fIp\fP point 
.RE
.PP

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Implemented in \fBQwtDial\fP, \fBQwtSlider\fP, and \fBQwtWheel\fP.
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Referenced by mousePressEvent(), and setPosition().
.SS "void QwtSliderBase::incValue (int steps)\fC [virtual, slot]\fP"
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Increment the value by a specified number of steps. 
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\fBParameters:\fP
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\fIsteps\fP number of steps 
.RE
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Reimplemented from \fBQwtDblRange\fP.
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Definition at line 531 of file qwt_sldbase.cpp.
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References QwtDblRange::incValue(), and stopMoving().
.SS "bool QwtSliderBase::isReadOnly () const"
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In read only mode the slider can磘 be controlled by mouse or keyboard.
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\fBReturns:\fP
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TRUE if read only 
.RE
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\fBSee also:\fP
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\fBsetReadOnly\fP 
.RE
.PP
Definition at line 66 of file qwt_sldbase.cpp.
.PP
Referenced by QwtDial::drawFocusIndicator(), keyPressEvent(), QwtDial::keyPressEvent(), QwtCompass::keyPressEvent(), mouseMoveEvent(), mousePressEvent(), mouseReleaseEvent(), and wheelEvent().
.SS "bool QwtSliderBase::isValid () const"
.PP
\fBSee also:\fP
.RS 4
\fBQwtDblRange::isValid\fP 
.RE
.PP

.PP
Reimplemented from \fBQwtDblRange\fP.
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Definition at line 66 of file qwt_sldbase.h.
.PP
References QwtDblRange::isValid().
.PP
Referenced by QwtDial::drawContents(), QwtKnob::drawKnob(), QwtAnalogClock::drawNeedle(), QwtCompass::drawScaleContents(), QwtSlider::drawSlider(), keyPressEvent(), QwtDial::keyPressEvent(), mouseMoveEvent(), mousePressEvent(), mouseReleaseEvent(), and wheelEvent().
.SS "void QwtSliderBase::keyPressEvent (QKeyEvent * e)\fC [protected, virtual]\fP"
.PP
Handles key events
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.IP "\(bu" 2
Key_Down, KeyLeft
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 Decrement by 1
.IP "\(bu" 2
Key_Up, Key_Right
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