C# カラーピッカーのスライダーを作ってみた

カラーピッカーとかで使うようなグラデーションのかかったスライダーを作ってみました。

相変わらず糞コードです。

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1. using System;  
2. using System;  
3. using System.ComponentModel;  
4. using System.Drawing;  
5. using System.Windows.Forms;  
6. using System.Drawing.Drawing2D;  
7.   
8. public partial class CSlider : Control  
9. {  
10.   
11.     // イベントの宣言  
12.     [Description("コントロールの値が変更するとき発生します。")]  
13.     [Category("アクション")]  
14.     public event EventHandler ValueChanged;  
15.   
16.     // プロパティ  
17.     private int _maximum = 100;  
18.     public int Maximum  
19.     {  
20.         set  
21.         {  
22.             this._maximum = value;  
23.         }  
24.         get  
25.         {  
26.             return this._maximum;  
27.         }  
28.     }  
29.   
30.     public int Minimum { get; set; }  
31.     private int _value;  
32.     public int Value  
33.     {  
34.         set  
35.         {  
36.             this._value = value;  
37.             drawGradation();  
38.             this.Refresh();  
39.             if (ValueChanged != null && Value <= Minimum && Value >= Maximum) ValueChanged(this, new EventArgs());  
40.         }  
41.         get  
42.         {  
43.             return this._value;  
44.         }  
45.     }  
46.     private Color _color1 = Color.Black;  
47.     public Color Color1  
48.     {  
49.         set  
50.         {  
51.             this._color1 = value;  
52.             drawGradation();  
53.             this.Refresh();  
54.         }  
55.         get  
56.         {  
57.   
58.             return this._color1;  
59.         }  
60.     }  
61.   
62.     private Color _color2 = Color.White;  
63.     public Color Color2  
64.     {  
65.         set  
66.         {  
67.             this._color2 = value;  
68.             drawGradation();  
69.             this.Refresh();  
70.         }  
71.         get  
72.         {  
73.   
74.             return this._color2;  
75.         }  
76.     }  
77.   
78.     public CSlider()  
79.     {  
80.         InitializeComponent();  
81.   
82.         this.SetStyle(ControlStyles.ResizeRedraw, true);  
83.         this.SetStyle(ControlStyles.DoubleBuffer, true);  
84.         this.SetStyle(ControlStyles.UserPaint, true);  
85.         this.SetStyle(ControlStyles.AllPaintingInWmPaint, true);  
86.   
87.         this.Resize += new System.EventHandler(this.CSlider_Resize);  
88.         this.MouseMove += new System.Windows.Forms.MouseEventHandler(this.CSlider_MouseMove);  
89.         this.MouseDown += new System.Windows.Forms.MouseEventHandler(this.CSlider_MouseDown);  
90.         this.MouseUp += new System.Windows.Forms.MouseEventHandler(this.CSlider_MouseUp);  
91.         this.MouseLeave += new System.EventHandler(this.CSlider_MouseLeave);  
92.         this.MouseEnter += new System.EventHandler(this.CSlider_MouseEnter);  
93.   
94.         drawTick();  
95.     }  
96.   
97.     // 描画  
98.     //針の描画  
99.     private Bitmap tick;  
100.     private void drawTick()  
101.     {  
102.         tick = new Bitmap(10, 10);  
103.   
104.         Graphics g = Graphics.FromImage(tick);  
105.         g.SmoothingMode = SmoothingMode.HighQuality;  
106.         Point[] point = {   new Point(5,1), new Point(9,5),  
107.                                 new Point(9,7), new Point(8,8),  
108.                                 new Point(2,8), new Point(1,7),  
109.                                 new Point(1,5), new Point(5,1) };  
110.         Brush b = new SolidBrush(Color.White);  
111.         g.FillPolygon(b, point);  
112.         Pen p = new Pen(Color.Black, 1);  
113.         if (activeFlag == true)  
114.         {  
115.             p = new Pen(Color.Brown, 1);  
116.         }  
117.         g.DrawLines(p, point);  
118.         g.Dispose();  
119.     }  
120.   
121.     protected override void OnPaint(PaintEventArgs pe)  
122.     {  
123.         base.OnPaint(pe);  
124.   
125.         pe.Graphics.DrawImage(gradation, 5, 0, gradation.Width, gradation.Height);  
126.         pe.Graphics.DrawImage(tick, (Value * gradation.Width) / (Maximum - Minimum), gradation.Height);  
127.   
128.     }  
129.   
130.     //グラデーションの描画  
131.     private Bitmap gradation;  
132.     private void drawGradation()  
133.     {  
134.         if (this.Width > 10 && this.Height > 10)  
135.         {  
136.             Size gradationSize = new Size(this.Width - 10, this.Height - 10);  
137.   
138.             gradation = new Bitmap(gradationSize.Width, gradationSize.Height);  
139.             Graphics g = Graphics.FromImage(gradation);  
140.             LinearGradientBrush gb =  
141.                 new LinearGradientBrush(new Point(0, 0), new Point(gradationSize.Width, gradationSize.Height),  
142.                     Color1, Color2);  
143.             g.FillRectangle(gb, new Rectangle(0, 0, gradationSize.Width, gradationSize.Height));  
144.   
145.             //枠線  
146.             Pen p = new Pen(Color.Black, 1);  
147.             if (activeFlag == true)  
148.             {  
149.                 p = new Pen(Color.Brown, 1);  
150.             }  
151.   
152.             g.DrawRectangle(p, 0, 0, gradationSize.Width - 1, gradationSize.Height - 1);  
153.             g.Dispose();  
154.         }  
155.   
156.     }  
157.   
158.   
159.     //リサイズ時、グラデーションの再描画  
160.     private void CSlider_Resize(object sender, EventArgs e)  
161.     {  
162.         drawGradation();  
163.         this.Refresh();  
164.     }  
165.   
166.   
167.     //プロパティ  
168.     private bool mouseDown = false;  
169.     private void CSlider_MouseDown(object sender, MouseEventArgs e)  
170.     {  
171.         Value = (int)(((float)(e.X - 5) / (this.Width - 10)) * (Maximum - Minimum));  
172.         if (Value <= Minimum) Value = Minimum;  
173.         if (Value >= Maximum) Value = Maximum;  
174.   
175.         this.Refresh();  
176.   
177.         if (ValueChanged != null) ValueChanged(this, new EventArgs());  
178.   
179.         mouseDown = true;  
180.     }  
181.   
182.     private void CSlider_MouseMove(object sender, MouseEventArgs e)  
183.     {  
184.         if (mouseDown == true)  
185.         {  
186.             Value = (int)(((float)(e.X - 5) / (this.Width - 10)) * (Maximum - Minimum));  
187.             if (Value <= Minimum) Value = Minimum;  
188.             if (Value >= Maximum) Value = Maximum;  
189.   
190.             this.Refresh();  
191.   
192.             if (ValueChanged != null) ValueChanged(this, new EventArgs());  
193.         }  
194.     }  
195.   
196.     private void CSlider_MouseUp(object sender, MouseEventArgs e)  
197.     {  
198.         mouseDown = false;  
199.     }  
200.   
201.   
202.     private bool activeFlag = false;  
203.     private void CSlider_MouseEnter(object sender, EventArgs e)  
204.     {  
205.         activeFlag = true;  
206.   
207.         drawGradation();  
208.         drawTick();  
209.         this.Refresh();  
210.     }  
211.   
212.     private void CSlider_MouseLeave(object sender, EventArgs e)  
213.     {  
214.         activeFlag = false;  
215.   
216.         drawGradation();  
217.         drawTick();  
218.         this.Refresh();  
219.     }  
220.   
221. }  

using System;
using System;
using System.ComponentModel;
using System.Drawing;
using System.Windows.Forms;
using System.Drawing.Drawing2D;

public partial class CSlider : Control
{

    // イベントの宣言
    [Description("コントロールの値が変更するとき発生します。")]
    [Category("アクション")]
    public event EventHandler ValueChanged;

    // プロパティ
    private int _maximum = 100;
    public int Maximum
    {
        set
        {
            this._maximum = value;
        }
        get
        {
            return this._maximum;
        }
    }

    public int Minimum { get; set; }
    private int _value;
    public int Value
    {
        set
        {
            this._value = value;
            drawGradation();
            this.Refresh();
            if (ValueChanged != null && Value <= Minimum && Value >= Maximum) ValueChanged(this, new EventArgs());
        }
        get
        {
            return this._value;
        }
    }
    private Color _color1 = Color.Black;
    public Color Color1
    {
        set
        {
            this._color1 = value;
            drawGradation();
            this.Refresh();
        }
        get
        {

            return this._color1;
        }
    }

    private Color _color2 = Color.White;
    public Color Color2
    {
        set
        {
            this._color2 = value;
            drawGradation();
            this.Refresh();
        }
        get
        {

            return this._color2;
        }
    }

    public CSlider()
    {
        InitializeComponent();

        this.SetStyle(ControlStyles.ResizeRedraw, true);
        this.SetStyle(ControlStyles.DoubleBuffer, true);
        this.SetStyle(ControlStyles.UserPaint, true);
        this.SetStyle(ControlStyles.AllPaintingInWmPaint, true);

        this.Resize += new System.EventHandler(this.CSlider_Resize);
        this.MouseMove += new System.Windows.Forms.MouseEventHandler(this.CSlider_MouseMove);
        this.MouseDown += new System.Windows.Forms.MouseEventHandler(this.CSlider_MouseDown);
        this.MouseUp += new System.Windows.Forms.MouseEventHandler(this.CSlider_MouseUp);
        this.MouseLeave += new System.EventHandler(this.CSlider_MouseLeave);
        this.MouseEnter += new System.EventHandler(this.CSlider_MouseEnter);

        drawTick();
    }

    // 描画
    //針の描画
    private Bitmap tick;
    private void drawTick()
    {
        tick = new Bitmap(10, 10);

        Graphics g = Graphics.FromImage(tick);
        g.SmoothingMode = SmoothingMode.HighQuality;
        Point[] point = {   new Point(5,1), new Point(9,5),
                                new Point(9,7), new Point(8,8),
                                new Point(2,8), new Point(1,7),
                                new Point(1,5), new Point(5,1) };
        Brush b = new SolidBrush(Color.White);
        g.FillPolygon(b, point);
        Pen p = new Pen(Color.Black, 1);
        if (activeFlag == true)
        {
            p = new Pen(Color.Brown, 1);
        }
        g.DrawLines(p, point);
        g.Dispose();
    }

    protected override void OnPaint(PaintEventArgs pe)
    {
        base.OnPaint(pe);

        pe.Graphics.DrawImage(gradation, 5, 0, gradation.Width, gradation.Height);
        pe.Graphics.DrawImage(tick, (Value * gradation.Width) / (Maximum - Minimum), gradation.Height);

    }

    //グラデーションの描画
    private Bitmap gradation;
    private void drawGradation()
    {
        if (this.Width > 10 && this.Height > 10)
        {
            Size gradationSize = new Size(this.Width - 10, this.Height - 10);

            gradation = new Bitmap(gradationSize.Width, gradationSize.Height);
            Graphics g = Graphics.FromImage(gradation);
            LinearGradientBrush gb =
                new LinearGradientBrush(new Point(0, 0), new Point(gradationSize.Width, gradationSize.Height),
                    Color1, Color2);
            g.FillRectangle(gb, new Rectangle(0, 0, gradationSize.Width, gradationSize.Height));

            //枠線
            Pen p = new Pen(Color.Black, 1);
            if (activeFlag == true)
            {
                p = new Pen(Color.Brown, 1);
            }

            g.DrawRectangle(p, 0, 0, gradationSize.Width - 1, gradationSize.Height - 1);
            g.Dispose();
        }

    }


    //リサイズ時、グラデーションの再描画
    private void CSlider_Resize(object sender, EventArgs e)
    {
        drawGradation();
        this.Refresh();
    }


    //プロパティ
    private bool mouseDown = false;
    private void CSlider_MouseDown(object sender, MouseEventArgs e)
    {
        Value = (int)(((float)(e.X - 5) / (this.Width - 10)) * (Maximum - Minimum));
        if (Value <= Minimum) Value = Minimum;
        if (Value >= Maximum) Value = Maximum;

        this.Refresh();

        if (ValueChanged != null) ValueChanged(this, new EventArgs());

        mouseDown = true;
    }

    private void CSlider_MouseMove(object sender, MouseEventArgs e)
    {
        if (mouseDown == true)
        {
            Value = (int)(((float)(e.X - 5) / (this.Width - 10)) * (Maximum - Minimum));
            if (Value <= Minimum) Value = Minimum;
            if (Value >= Maximum) Value = Maximum;

            this.Refresh();

            if (ValueChanged != null) ValueChanged(this, new EventArgs());
        }
    }

    private void CSlider_MouseUp(object sender, MouseEventArgs e)
    {
        mouseDown = false;
    }


    private bool activeFlag = false;
    private void CSlider_MouseEnter(object sender, EventArgs e)
    {
        activeFlag = true;

        drawGradation();
        drawTick();
        this.Refresh();
    }

    private void CSlider_MouseLeave(object sender, EventArgs e)
    {
        activeFlag = false;

        drawGradation();
        drawTick();
        this.Refresh();
    }

}

//日記　すき焼きともつ鍋食べた。うまかった。