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oliversalzburgoliversalzburg
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Added slider that displays value in numerical form
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‎Graph/Graph.csproj

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<Reference Include="System.Xml" />
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</ItemGroup>
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<ItemGroup>
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<Compile Include="Items\NodeNumericSliderItem.cs" />
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<Compile Include="NodeSelection.cs" />
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<Compile Include="Items\NodeDropDownItem.cs" />
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<Compile Include="SelectionForm.cs">

‎Graph/Items/NodeNumericSliderItem.cs

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#region License
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// Copyright (c) 2009 Sander van Rossen
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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#endregion
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Windows.Forms;
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using System.Drawing;
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using System.Drawing.Drawing2D;
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namespace Graph.Items
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{
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public sealed class NodeNumericSliderItem : NodeItem
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{
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public event EventHandler<NodeItemEventArgs> Clicked;
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public event EventHandler<NodeItemEventArgs> ValueChanged;
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public NodeNumericSliderItem(string text, float sliderSize, float textSize, float minValue, float maxValue, float defaultValue, bool inputEnabled, bool outputEnabled) :
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base(inputEnabled, outputEnabled)
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{
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this.Text = text;
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this.MinimumSliderSize = sliderSize;
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this.TextSize = textSize;
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this.MinValue = Math.Min(minValue, maxValue);
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this.MaxValue = Math.Max(minValue, maxValue);
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this.Value = defaultValue;
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}
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#region Text
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string internalText = string.Empty;
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public string Text
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{
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get { return internalText; }
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set
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{
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if (internalText == value)
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return;
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internalText = value;
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itemSize = Size.Empty;
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}
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}
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#endregion
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#region Dragging
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internal bool Dragging { get; set; }
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#endregion
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public float MinimumSliderSize { get; set; }
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public float TextSize { get; set; }
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public float MinValue { get; set; }
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public float MaxValue { get; set; }
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float internalValue = 0.0f;
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public float Value
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{
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get { return internalValue; }
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set
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{
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var newValue = value;
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if (newValue < MinValue) newValue = MinValue;
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if (newValue > MaxValue) newValue = MaxValue;
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if (internalValue == newValue)
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return;
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internalValue = newValue;
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if (ValueChanged != null)
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ValueChanged(this, new NodeItemEventArgs(this));
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}
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}
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public override bool OnClick()
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{
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base.OnClick();
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if (Clicked != null)
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Clicked(this, new NodeItemEventArgs(this));
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return true;
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}
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public override bool OnStartDrag(PointF location, out PointF original_location)
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{
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base.OnStartDrag(location, out original_location);
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var size = (MaxValue - MinValue);
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original_location.Y = location.Y;
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original_location.X = ((Value / size) * sliderRect.Width) + sliderRect.Left;
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Value = ((location.X - sliderRect.Left) / sliderRect.Width) * size;
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Dragging = true;
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return true;
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}
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public override bool OnDrag(PointF location)
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{
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base.OnDrag(location);
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var size = (MaxValue - MinValue);
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Value = ((location.X - sliderRect.Left) / sliderRect.Width) * size;
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return true;
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}
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public override bool OnEndDrag() { base.OnEndDrag(); Dragging = false; return true; }
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internal SizeF itemSize;
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internal SizeF textSize;
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internal RectangleF sliderRect;
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const int SliderBoxSize = 4;
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const int SliderHeight = 12;
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const int Spacing = 2;
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internal override SizeF Measure(Graphics graphics)
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{
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if (!string.IsNullOrWhiteSpace(this.Text))
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{
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if (this.itemSize.IsEmpty)
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{
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var size = new Size(GraphConstants.MinimumItemWidth, GraphConstants.MinimumItemHeight);
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var sliderWidth = this.MinimumSliderSize + SliderBoxSize;
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this.textSize = (SizeF)graphics.MeasureString(this.Text, SystemFonts.MenuFont, size, GraphConstants.LeftMeasureTextStringFormat);
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this.textSize.Width = Math.Max(this.TextSize, this.textSize.Width + 4);
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this.itemSize.Width = Math.Max(size.Width, this.textSize.Width + sliderWidth + Spacing);
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this.itemSize.Height = Math.Max(size.Height, this.textSize.Height);
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}
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return this.itemSize;
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} else
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{
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return new SizeF(GraphConstants.MinimumItemWidth, GraphConstants.MinimumItemHeight);
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}
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}
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internal override void Render(Graphics graphics, SizeF minimumSize, PointF location)
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{
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var size = Measure(graphics);
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size.Width = Math.Max(minimumSize.Width, size.Width);
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size.Height = Math.Max(minimumSize.Height, size.Height);
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var sliderOffset = Spacing + this.textSize.Width;
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var sliderWidth = size.Width - sliderOffset ;
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var textRect = new RectangleF(location, size);
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var sliderBox = new RectangleF(location, size);
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var sliderRect = new RectangleF(location, size);
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// Calculate bounds for outer rectangle
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sliderRect.X = sliderRect.Right - sliderWidth;
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sliderRect.Y += ((sliderRect.Bottom - sliderRect.Top) - SliderHeight) / 2.0f;
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sliderRect.Width = sliderWidth;
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sliderRect.Height = SliderHeight;
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textRect.Width -= sliderWidth + Spacing;
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var valueSize = (this.MaxValue - this.MinValue);
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this.sliderRect = sliderRect;
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this.sliderRect.X += SliderBoxSize / 2.0f;
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// Calculate bounds for inner rectangle
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sliderBox.X = sliderRect.X;
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sliderBox.Y = sliderRect.Y;
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sliderBox.Width = (this.Value * this.sliderRect.Width) / valueSize;
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sliderBox.Height = SliderHeight;
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// Draw label
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graphics.DrawString(this.Text, SystemFonts.MenuFont, Brushes.Black, textRect, GraphConstants.LeftTextStringFormat);
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// Draw inner rectangle
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graphics.FillRectangle(Brushes.LightGray, sliderBox.X, sliderBox.Y, sliderBox.Width, sliderBox.Height);
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// Draw outer rectangle
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if ((state & (RenderState.Hover | RenderState.Dragging)) != 0)
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graphics.DrawRectangle(Pens.White, sliderRect.X, sliderRect.Y, sliderRect.Width, sliderRect.Height);
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else
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graphics.DrawRectangle(Pens.Black, sliderRect.X, sliderRect.Y, sliderRect.Width, sliderRect.Height);
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// Draw value marker into box
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if ((state & (RenderState.Hover | RenderState.Dragging)) != 0)
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graphics.DrawLine(Pens.White, sliderBox.X + sliderBox.Width, sliderBox.Y, sliderBox.X + sliderBox.Width, sliderBox.Y + sliderBox.Height);
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else
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graphics.DrawLine(Pens.Black, sliderBox.X + sliderBox.Width, sliderBox.Y, sliderBox.X + sliderBox.Width, sliderBox.Y + sliderBox.Height);
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// Draw value
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graphics.DrawString(this.Value.ToString(), SystemFonts.MenuFont, Brushes.Black, sliderRect, GraphConstants.LeftTextStringFormat);
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}
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}
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}

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