Comment changez-vous la couleur de la bordure d'une zone de groupe?

Question

Dans C # .NET, j'essaie de modifier par programme la couleur de la bordure dans une zone de groupe.

Mise à jour: Cette question a été posée lorsque je travaillais sur un système Winforms avant de passer à .NET.

Mick Bruno · Accepted Answer

En s'appuyant sur la réponse précédente, une meilleure solution qui inclut le libellé de la zone de groupe:

groupBox1.Paint += PaintBorderlessGroupBox; private void PaintBorderlessGroupBox(object sender, PaintEventArgs p) { GroupBox box = (GroupBox)sender; p.Graphics.Clear(SystemColors.Control); p.Graphics.DrawString(box.Text, box.Font, Brushes.Black, 0, 0); }

Vous voudrez peut-être ajuster le x/y pour le texte, mais pour mon usage, c'est juste.

user1944617 · Answer

Ajoutez simplement l'événement Paint.

 private void groupBox1_Paint(object sender, PaintEventArgs e) { GroupBox box = sender as GroupBox; DrawGroupBox(box, e.Graphics, Color.Red, Color.Blue); } private void DrawGroupBox(GroupBox box, Graphics g, Color textColor, Color borderColor) { if (box != null) { Brush textBrush = new SolidBrush(textColor); Brush borderBrush = new SolidBrush(borderColor); Pen borderPen = new Pen(borderBrush); SizeF strSize = g.MeasureString(box.Text, box.Font); Rectangle rect = new Rectangle(box.ClientRectangle.X, box.ClientRectangle.Y + (int)(strSize.Height / 2), box.ClientRectangle.Width - 1, box.ClientRectangle.Height - (int)(strSize.Height / 2) - 1); // Clear text and border g.Clear(this.BackColor); // Draw text g.DrawString(box.Text, box.Font, textBrush, box.Padding.Left, 0); // Drawing Border //Left g.DrawLine(borderPen, rect.Location, new Point(rect.X, rect.Y + rect.Height)); //Right g.DrawLine(borderPen, new Point(rect.X + rect.Width, rect.Y), new Point(rect.X + rect.Width, rect.Y + rect.Height)); //Bottom g.DrawLine(borderPen, new Point(rect.X, rect.Y + rect.Height), new Point(rect.X + rect.Width, rect.Y + rect.Height)); //Top1 g.DrawLine(borderPen, new Point(rect.X, rect.Y), new Point(rect.X + box.Padding.Left, rect.Y)); //Top2 g.DrawLine(borderPen, new Point(rect.X + box.Padding.Left + (int)(strSize.Width), rect.Y), new Point(rect.X + rect.Width, rect.Y)); } }

Andy · Answer

Définissez simplement l'action Paint sur n'importe quel objet (pas seulement sur les boutons) avec cette méthode pour dessiner une bordure.

 private void UserControl1_Paint(object sender, PaintEventArgs e) { ControlPaint.DrawBorder(e.Graphics, this.ClientRectangle, Color.Red, ButtonBorderStyle.Solid); }

Il ne sera toujours pas joli et arrondi comme l'original, mais c'est beaucoup plus simple.

Brett Leuszler · Answer

FWIW, c'est l'implémentation que j'ai utilisée. C'est un enfant de GroupBox mais permet de définir non seulement la BorderColor, mais aussi l'épaisseur de la bordure et le rayon des coins arrondis. En outre, vous pouvez définir la quantité de retrait que vous souhaitez pour le libellé GroupBox et utiliser un retrait négatif du côté droit.

using System; using System.Drawing; using System.Windows.Forms; namespace BorderedGroupBox { public class BorderedGroupBox : GroupBox { private Color _borderColor = Color.Black; private int _borderWidth = 2; private int _borderRadius = 5; private int _textIndent = 10; public BorderedGroupBox() : base() { InitializeComponent(); this.Paint += this.BorderedGroupBox_Paint; } public BorderedGroupBox(int width, float radius, Color color) : base() { this._borderWidth = Math.Max(1,width); this._borderColor = color; this._borderRadius = Math.Max(0,radius); InitializeComponent(); this.Paint += this.BorderedGroupBox_Paint; } public Color BorderColor { get => this._borderColor; set { this._borderColor = value; DrawGroupBox(); } } public int BorderWidth { get => this._borderWidth; set { if (value > 0) { this._borderWidth = Math.Min(value, 10); DrawGroupBox(); } } } public int BorderRadius { get => this._borderRadius; set { // Setting a radius of 0 produces square corners... if (value >= 0) { this._borderRadius = value; this.DrawGroupBox(); } } } public int LabelIndent { get => this._textIndent; set { this._textIndent = value; this.DrawGroupBox(); } } private void BorderedGroupBox_Paint(object sender, PaintEventArgs e) => DrawGroupBox(e.Graphics); private void DrawGroupBox() => this.DrawGroupBox(this.CreateGraphics()); private void DrawGroupBox(Graphics g) { Brush textBrush = new SolidBrush(this.ForeColor); SizeF strSize = g.MeasureString(this.Text, this.Font); Brush borderBrush = new SolidBrush(this.BorderColor); Pen borderPen = new Pen(borderBrush,(float)this._borderWidth); Rectangle rect = new Rectangle(this.ClientRectangle.X, this.ClientRectangle.Y + (int)(strSize.Height / 2), this.ClientRectangle.Width - 1, this.ClientRectangle.Height - (int)(strSize.Height / 2) - 1); Brush labelBrush = new SolidBrush(this.BackColor); // Clear text and border g.Clear(this.BackColor); // Drawing Border (added "Fix" from Jim Fell, Oct 6, '18) int rectX = (0 == this._borderWidth % 2) ? rect.X + this._borderWidth / 2 : rect.X + 1 + this._borderWidth / 2; int rectHeight = (0 == this._borderWidth % 2) ? rect.Height - this._borderWidth / 2 : rect.Height - 1 - this._borderWidth / 2; // NOTE DIFFERENCE: rectX vs rect.X and rectHeight vs rect.Height g.DrawRoundedRectangle(borderPen, rectX, rect.Y, rect.Width, rectHeight, (float)this._borderRadius); // Draw text if (this.Text.Length > 0) { // Do some work to ensure we don't put the label outside // of the box, regardless of what value is assigned to the Indent: int width = (int)rect.Width, posX; posX = (this._textIndent < 0) ? Math.Max(0-width,this._textIndent) : Math.Min(width, this._textIndent); posX = (posX < 0) ? rect.Width + posX - (int)strSize.Width : posX; g.FillRectangle(labelBrush, posX, 0, strSize.Width, strSize.Height); g.DrawString(this.Text, this.Font, textBrush, posX, 0); } } #region Component Designer generated code /// <summary>Required designer variable.</summary> private System.ComponentModel.IContainer components = null; /// <summary>Clean up any resources being used.</summary> /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param> protected override void Dispose(bool disposing) { if (disposing && (components != null)) components.Dispose(); base.Dispose(disposing); } /// <summary>Required method for Designer support - Don't modify!</summary> private void InitializeComponent() => components = new System.ComponentModel.Container(); #endregion } }

Pour le faire fonctionner, vous devez également étendre la classe Graphics de base (Remarque: cela est dérivé d'un code que j'ai trouvé ici une fois lorsque j'essayais de créer un contrôle Panel à coins arrondis, mais je ne trouve pas le message d'origine à lier ici):

static class GraphicsExtension { private static GraphicsPath GenerateRoundedRectangle( this Graphics graphics, RectangleF rectangle, float radius) { float diameter; GraphicsPath path = new GraphicsPath(); if (radius <= 0.0F) { path.AddRectangle(rectangle); path.CloseFigure(); return path; } else { if (radius >= (Math.Min(rectangle.Width, rectangle.Height)) / 2.0) return graphics.GenerateCapsule(rectangle); diameter = radius * 2.0F; SizeF sizeF = new SizeF(diameter, diameter); RectangleF arc = new RectangleF(rectangle.Location, sizeF); path.AddArc(arc, 180, 90); arc.X = rectangle.Right - diameter; path.AddArc(arc, 270, 90); arc.Y = rectangle.Bottom - diameter; path.AddArc(arc, 0, 90); arc.X = rectangle.Left; path.AddArc(arc, 90, 90); path.CloseFigure(); } return path; } private static GraphicsPath GenerateCapsule( this Graphics graphics, RectangleF baseRect) { float diameter; RectangleF arc; GraphicsPath path = new GraphicsPath(); try { if (baseRect.Width > baseRect.Height) { diameter = baseRect.Height; SizeF sizeF = new SizeF(diameter, diameter); arc = new RectangleF(baseRect.Location, sizeF); path.AddArc(arc, 90, 180); arc.X = baseRect.Right - diameter; path.AddArc(arc, 270, 180); } else if (baseRect.Width < baseRect.Height) { diameter = baseRect.Width; SizeF sizeF = new SizeF(diameter, diameter); arc = new RectangleF(baseRect.Location, sizeF); path.AddArc(arc, 180, 180); arc.Y = baseRect.Bottom - diameter; path.AddArc(arc, 0, 180); } else path.AddEllipse(baseRect); } catch { path.AddEllipse(baseRect); } finally { path.CloseFigure(); } return path; } /// <summary> /// Draws a rounded rectangle specified by a pair of coordinates, a width, a height and the radius /// for the arcs that make the rounded edges. /// </summary> /// <param name="brush">System.Drawing.Pen that determines the color, width and style of the rectangle.</param> /// <param name="x">The x-coordinate of the upper-left corner of the rectangle to draw.</param> /// <param name="y">The y-coordinate of the upper-left corner of the rectangle to draw.</param> /// <param name="width">Width of the rectangle to draw.</param> /// <param name="height">Height of the rectangle to draw.</param> /// <param name="radius">The radius of the arc used for the rounded edges.</param> public static void DrawRoundedRectangle( this Graphics graphics, Pen pen, float x, float y, float width, float height, float radius) { RectangleF rectangle = new RectangleF(x, y, width, height); GraphicsPath path = graphics.GenerateRoundedRectangle(rectangle, radius); SmoothingMode old = graphics.SmoothingMode; graphics.SmoothingMode = SmoothingMode.AntiAlias; graphics.DrawPath(pen, path); graphics.SmoothingMode = old; } /// <summary> /// Draws a rounded rectangle specified by a pair of coordinates, a width, a height and the radius /// for the arcs that make the rounded edges. /// </summary> /// <param name="brush">System.Drawing.Pen that determines the color, width and style of the rectangle.</param> /// <param name="x">The x-coordinate of the upper-left corner of the rectangle to draw.</param> /// <param name="y">The y-coordinate of the upper-left corner of the rectangle to draw.</param> /// <param name="width">Width of the rectangle to draw.</param> /// <param name="height">Height of the rectangle to draw.</param> /// <param name="radius">The radius of the arc used for the rounded edges.</param> public static void DrawRoundedRectangle( this Graphics graphics, Pen pen, int x, int y, int width, int height, int radius) { graphics.DrawRoundedRectangle( pen, Convert.ToSingle(x), Convert.ToSingle(y), Convert.ToSingle(width), Convert.ToSingle(height), Convert.ToSingle(radius)); } }

swajak · Answer

Je ne suis pas sûr que cela s'applique à tous les cas, mais grâce à ce fil, nous nous sommes rapidement accrochés à l'événement Paint par programmation en utilisant:

GroupBox box = new GroupBox(); [...] box.Paint += delegate(object o, PaintEventArgs p) { p.Graphics.Clear(someColorHere); };

À votre santé!

George · Answer

J'ai atteint la même frontière avec quelque chose qui pourrait être plus simple à comprendre pour les débutants:

 private void groupSchitaCentru_Paint(object sender, PaintEventArgs e) { Pen blackPen = new Pen(Color.Black, 2); Point pointTopLeft = new Point(0, 7); Point pointBottomLeft = new Point(0, groupSchitaCentru.ClientRectangle.Height); Point pointTopRight = new Point(groupSchitaCentru.ClientRectangle.Width, 7); Point pointBottomRight = new Point(groupSchitaCentru.ClientRectangle.Width, groupSchitaCentru.ClientRectangle.Height); e.Graphics.DrawLine(blackPen, pointTopLeft, pointBottomLeft); e.Graphics.DrawLine(blackPen, pointTopLeft, pointTopRight); e.Graphics.DrawLine(blackPen, pointBottomRight, pointTopRight); e.Graphics.DrawLine(blackPen, pointBottomLeft, pointBottomRight); }

Je ne sais pas, peut-être que cela aide quelqu'un qui cherche à réaliser cet ajustement de la frontière.