QwtPickerDragRectMachine类 参考

A state machine for rectangle selections 更多...

#include <qwt_picker_machine.h>

类 QwtPickerDragRectMachine 继承关系图:

Public 成员函数
	QwtPickerDragRectMachine ()
	Constructor
virtual QList< Command >	transition (const QwtEventPattern &, const QEvent *) override
	Transition function that processes events and returns commands
Public 成员函数 继承自 QwtPickerMachine
	QwtPickerMachine (SelectionType)
	Constructor
virtual	~QwtPickerMachine ()
	Destructor
void	reset ()
	Set the current state to 0 (initial state)
int	state () const
	Return the current state
void	setState (int)
	Change the current state
SelectionType	selectionType () const
	Return the selection type

额外继承的成员函数
Public 类型 继承自 QwtPickerMachine
enum	SelectionType { NoSelection = -1 , PointSelection , RectSelection , PolygonSelection }
	Type of a selection. 更多...
enum	Command {   Begin , Append , Move , Remove ,   End }
	Commands - the output of a state machine

详细描述

A state machine for rectangle selections

Pressing QwtEventPattern::MouseSelect1 selects the first point, releasing it the second point. Pressing QwtEventPattern::KeySelect1 also selects the first point, a second press selects the second point and terminates the selection.

参见

QwtEventPattern::MousePatternCode, QwtEventPattern::KeyPatternCode

成员函数说明

transition()

QList< QwtPickerMachine::Command > QwtPickerDragRectMachine::transition ( const QwtEventPattern &  eventPattern, const QEvent *  event  )

overridevirtual

Transition function that processes events and returns commands

参数

[in]	eventPattern	Event pattern for matching
[in]	event	Event to process

返回

List of commands generated by the transition

实现了 QwtPickerMachine.

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该类的文档由以下文件生成:

• /home/runner/work/QWT/QWT/src/plot/qwt_picker_machine.h
• /home/runner/work/QWT/QWT/src/plot/qwt_picker_machine.cpp