/// <summary>
/// Summary description for Positioner.
/// Flyweight Patterns享元 模式
///20220918
/// geovindu,Geovin Du,涂聚文
/// </summary>
public class Positioner
{
private const int pLeft = 30;
private const int pTop = 30;
private const int HSpace = 70;
private const int VSpace = 80;
private const int rowMax = 2;
private int x, y, cnt;
/// <summary>
///
/// </summary>
public Positioner()
{
reset();
}
/// <summary>
///
/// </summary>
public void reset()
{
x = pLeft;
y = pTop;
cnt = 0;
}
/// <summary>
///
/// </summary>
/// <returns></returns>
public int nextX()
{
return x;
}
/// <summary>
///
/// </summary>
public void incr()
{
cnt++;
if (cnt > rowMax)
{ //reset to start new row
cnt = 0;
x = pLeft;
y += VSpace;
}
else
{
x += HSpace;
}
}
/// <summary>
///
/// </summary>
/// <returns></returns>
public int nextY()
{
return y;
}
}
/// <summary>
/// Flyweight Patterns享元 模式
///20220918
/// geovindu,Geovin Du,涂聚文
/// </summary>
public class Rectangle
{
private int x1, x2, y1, y2;
private int w, h;
public Rectangle() { }
/// <summary>
///
/// </summary>
/// <param name="x"></param>
/// <param name="y"></param>
public void init(int x, int y)
{
x1 = x;
y1 = y;
x2 = x1 + w;
y2 = y1 + h;
}
/// <summary>
///
/// </summary>
/// <param name="w_"></param>
/// <param name="h_"></param>
public void setSize(int w_, int h_)
{
w = w_;
h = h_;
}
/// <summary>
///
/// </summary>
/// <param name="xp"></param>
/// <param name="yp"></param>
/// <returns></returns>
public bool contains(int xp, int yp)
{
return (x1 <= xp) && (xp <= x2) &&
(y1 <= yp) && (yp <= y2);
}
}
/// <summary>
/// Summary description for Folder.
/// Flyweight Patterns享元 模式
///20220918
/// geovindu,Geovin Du,涂聚文
/// </summary>
public class Folder
{
//Draws a folder at the specified coordinates
private const int w = 50;
private const int h = 30;
private Pen blackPen, whitePen;
private Pen grayPen;
private SolidBrush backBrush, blackBrush;
private Font fnt;
/// <summary>
///
/// </summary>
/// <param name="col"></param>
public Folder(Color col)
{
backBrush = new SolidBrush(col);
blackBrush = new SolidBrush(Color.Black);
blackPen = new Pen(Color.Black);
whitePen = new Pen(Color.White);
grayPen = new Pen(Color.Gray);
fnt = new Font("Arial", 12);
}
/// <summary>
///
/// </summary>
/// <param name="g"></param>
/// <param name="x"></param>
/// <param name="y"></param>
/// <param name="title"></param>
public void draw(Graphics g, int x, int y, string title)
{
g.FillRectangle(backBrush, x, y, w, h);
g.DrawRectangle(blackPen, x, y, w, h);
g.DrawLine(whitePen, x + 1, y + 1, x + w - 1, y + 1);
g.DrawLine(whitePen, x + 1, y, x + 1, y + h);
g.DrawRectangle(blackPen, x + 5, y - 5, 15, 5);
g.FillRectangle(backBrush, x + 6, y - 4, 13, 6);
g.DrawLine(grayPen, x, y + h - 1, x + w, y + h - 1);
g.DrawLine(grayPen, x + w - 1, y, x + w - 1, y + h - 1);
g.DrawString(title, fnt, blackBrush, x, y + h + 5);
}
}
/// <summary>
/// Summary description for FolderFactory.
/// Flyweight Patterns享元 模式
///20220918
/// geovindu,Geovin Du,涂聚文
/// </summary>
public class FolderFactory
{
private Folder selFolder, unselFolder;
/// <summary>
///
/// </summary>
public FolderFactory()
{
//create the two folders
selFolder = new Folder(Color.Brown);
unselFolder = new Folder(Color.Bisque);
}
/// <summary>
///
/// </summary>
/// <param name="selected"></param>
/// <returns></returns>
public Folder getFolder(bool selected)
{
if (selected)
return selFolder;
else
return unselFolder;
}
}
窗体调用：
/// <summary>
/// Flyweight Patterns享元 模式
///20220918
/// geovindu,Geovin Du,涂聚文
/// </summary>
public partial class FlyweightPatternsForm : Form
{
private ArrayList names;
private Folder fol;
private const int pLeft = 30;
private const int pTop = 30;
private const int HSpace = 70;
private const int VSpace = 80;
private const int rowMax = 2;
private string selectedName;
private FlyweightPatterns.Rectangle rect;
private FolderFactory folFact;
private Positioner posn;
/// <summary>
///
/// </summary>
private void init()
{
names = new ArrayList();
names.Add("Adam");
names.Add("Bill");
names.Add("Charlie");
names.Add("Dave");
names.Add("Edward");
names.Add("Fred");
names.Add("George");
fol = new Folder(Color.Bisque);
selectedName = (string)names[0];
Pic.Paint += new PaintEventHandler(picPaint);
rect = new FlyweightPatterns.Rectangle();
rect.setSize(50, 30);
folFact = new FolderFactory();
posn = new Positioner();
}
/// <summary>
///
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void picPaint(object sender, PaintEventArgs e)
{
Graphics g = e.Graphics;
posn.reset();
for (int i = 0; i < names.Count; i++)
{
fol = folFact.getFolder(selectedName.Equals((string)names[i]));
fol.draw(g, posn.nextX(), posn.nextY(), (string)names[i]);
posn.incr();
}
}
/// <summary>
///
/// </summary>
public FlyweightPatternsForm()
{
InitializeComponent();
init();
}
/// <summary>
///
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void FlyweightPatternsForm_Load(object sender, EventArgs e)
{
}
/// <summary>
///
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void Pic_Click(object sender, EventArgs e)
{
}
/// <summary>
///
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void Pic_MouseMove(object sender, MouseEventArgs e)
{
string oldname = selectedName; //save old name
bool found = false;
posn.reset();
int i = 0;
selectedName = "";
while (i < names.Count && !found)
{
rect.init(posn.nextX(), posn.nextY());
//see if a rectangle contains the mouse
if (rect.contains(e.X, e.Y))
{
selectedName = (string)names[i];
found = true;
}
posn.incr();
i++;
}
//only refresh if mouse in new rectangle
if (!oldname.Equals(selectedName))
{
Pic.Refresh();
}
}
}
输出：
