VisionPlus_V3.0/VisionPlus/WindowAppItemIsometricLine.h

#pragma once

#include "Common.h"
#include "CommonDraw.h"


/// <summary>
/// 用于显示功能块等高线和等宽线的信息参数结构体
/// </summary>
typedef struct _tagUiIsoLineInfo
{
	// 需要绘制等宽线的控件信息
	QWidget*					pWidget;

	// 等宽线的绘制方向
	SIDE_DIRECTION				sideDir;

	// 当前拖拽方向（仅确定源控件的等宽线位置时需要用到）
	STRETCH_DIRECTION			stretchDir;

	// 默认构造函数
	_tagUiIsoLineInfo()
	{
		pWidget = nullptr;

		sideDir = SIDE_DIRECTION::SIDE_NONE;

		stretchDir = STRETCH_DIRECTION::DIR_NONE;
	}

	// 带参数构造函数
	_tagUiIsoLineInfo(
		QWidget* widget,
		SIDE_DIRECTION side, 
		STRETCH_DIRECTION sDir = STRETCH_DIRECTION::DIR_NONE
	)
	{
		this->pWidget = widget;
		this->sideDir = side;
		this->stretchDir = sDir;
	}

} UI_ISOLINE_INFO;


/// <summary>
/// UI等高线类，用于绘制和现实UI界面中控件尺寸对齐时显示的等高线和等宽线
/// </summary>
class WindowAppItemIsometricLine : public QObject, public QGraphicsLineItem
{
	Q_OBJECT

public:

	WindowAppItemIsometricLine(const UI_ISOLINE_INFO& lineInfo);

	// 设定本Item的自定义类型
	enum { Type = ITEM_TYPE_ISO_LINE };

	int type() const
	{
		// 针对该 item 启用 qgraphicsitem_cast
		return Type;
	}

public:

	// 本等宽线的具体参数信息
	UI_ISOLINE_INFO			m_isoLineInfo;

protected slots:

	// 绘制线条
	void paint(QPainter* painter, const QStyleOptionGraphicsItem* option, QWidget* widget = nullptr) override;

protected:

	// 绘制等宽线
	void drawIsoLines(QPainter* painter);

	// 在指定的边旁边绘制等宽线
	void drawIsoLines(QPainter* painter, const QLine& side, SIDE_DIRECTION sideDir);

	// 绘制箭头线条
	void drawIsoArrowLines(QPainter* painter, QLine line1, QLine line2, SIDE_DIRECTION sideDir);

	// 为指定的线条绘制箭头
	void drawIsoArrow(QPainter* painter, QLineF isoLine);
};