Propagate DPI Changes down to Drawable Containers and Adorners and Resize Grippers Accordingly (#200)

* Propagate DPI Changes down to Drawable Containers and Adorners and Resize Grippers Accordingly
* Make Grippers Slightly Larger
* Add White Border to Grippers for Better Contrast on Dark Backgrounds

Greenshot/Drawing/Adorners/AbstractAdorner.cs

@@ -22,6 +22,7 @@
 using System.Drawing;
 using System.Drawing.Drawing2D;
 using System.Windows.Forms;
+using GreenshotPlugin.Core;
 using GreenshotPlugin.Interfaces.Drawing;
 using GreenshotPlugin.Interfaces.Drawing.Adorners;
 
@@ -31,7 +32,8 @@ namespace Greenshot.Drawing.Adorners
 	{
 		public virtual EditStatus EditStatus { get; protected set; } = EditStatus.IDLE;
 
-		protected Size _size = new Size(4, 4);
+		private static readonly Size defaultSize = new Size(6, 6);
+		protected Size _size = defaultSize;
 
 		public AbstractAdorner(IDrawableContainer owner)
 		{
@@ -139,6 +141,15 @@ namespace Greenshot.Drawing.Adorners
 			}
 		}
 
+		/// <summary>
+		/// Adjust UI elements to the supplied DPI settings
+		/// </summary>
+		/// <param name="dpi"></param>
+		public void AdjustToDpi(uint dpi)
+		{
+			_size = DpiHelper.ScaleWithDpi(defaultSize, dpi);
+		}
+
 		/// <summary>
 		/// Draw the adorner
 		/// </summary>

Greenshot/Drawing/Adorners/MoveAdorner.cs

@@ -145,14 +145,12 @@ namespace Greenshot.Drawing.Adorners
 			var bounds = BoundsOnSurface;
 			GraphicsState state = targetGraphics.Save();
 
-			targetGraphics.SmoothingMode = SmoothingMode.None;
 			targetGraphics.CompositingMode = CompositingMode.SourceCopy;
-			targetGraphics.PixelOffsetMode = PixelOffsetMode.Half;
-			targetGraphics.InterpolationMode = InterpolationMode.NearestNeighbor;
 
 			try
 			{
-				targetGraphics.FillRectangle(Brushes.Black, bounds.X, bounds.Y, bounds.Width, bounds.Height);
+				targetGraphics.FillRectangle(Brushes.Black, bounds);
+				targetGraphics.DrawRectangle(new Pen(Brushes.White), bounds);
 			}
 			catch
 			{

Greenshot/Drawing/Adorners/ResizeAdorner.cs

@@ -172,12 +172,10 @@ namespace Greenshot.Drawing.Adorners
 			var bounds = BoundsOnSurface;
 			GraphicsState state = targetGraphics.Save();
 
-			targetGraphics.SmoothingMode = SmoothingMode.None;
 			targetGraphics.CompositingMode = CompositingMode.SourceCopy;
-			targetGraphics.PixelOffsetMode = PixelOffsetMode.Half;
-			targetGraphics.InterpolationMode = InterpolationMode.NearestNeighbor;
 
-			targetGraphics.FillRectangle(Brushes.Black, bounds.X, bounds.Y, bounds.Width , bounds.Height);
+			targetGraphics.FillRectangle(Brushes.Black, bounds);
+			targetGraphics.DrawRectangle(new Pen(Brushes.White), bounds);
 			targetGraphics.Restore(state);
 		}
 	}

Greenshot/Drawing/Adorners/TargetAdorner.cs

@@ -97,7 +97,8 @@ namespace Greenshot.Drawing.Adorners
 			Graphics targetGraphics = paintEventArgs.Graphics;
 
 			var bounds = BoundsOnSurface;
-			targetGraphics.FillRectangle(Brushes.Green, bounds.X, bounds.Y, bounds.Width, bounds.Height);
+            targetGraphics.FillRectangle(Brushes.Green, bounds);
+			targetGraphics.DrawRectangle(new Pen(Brushes.White), bounds);
 		}
 
 		/// <summary>

Greenshot/Drawing/DrawableContainer.cs

@@ -369,6 +369,18 @@ namespace Greenshot.Drawing
 			Draw(graphics, renderMode);
 		}
 
+		/// <summary>
+		/// Adjust UI elements to the supplied DPI settings
+		/// </summary>
+		/// <param name="dpi"></param>
+		public void AdjustToDpi(uint dpi)
+		{
+			foreach(var adorner in Adorners) 
+			{
+				adorner.AdjustToDpi(dpi);
+			}
+		}
+
 		public virtual bool Contains(int x, int y) {
 			return Bounds.Contains(x , y);
 		}

Greenshot/Drawing/DrawableContainerList.cs

@@ -604,5 +604,16 @@ namespace Greenshot.Drawing {
 			// Do not change this code. Put cleanup code in Dispose(bool disposing) above.
 			Dispose(true);
 		}
-    }
+
+		/// <summary>
+		/// Adjust UI elements to the supplied DPI settings
+		/// </summary>
+		/// <param name="dpi"></param>
+		public void AdjustToDpi(uint dpi)
+		{
+			foreach (var drawableContainer in this) {
+				drawableContainer.AdjustToDpi(dpi);
+			}
+		}
+	}
 }

Greenshot/Drawing/Surface.cs

@@ -432,6 +432,17 @@ namespace Greenshot.Drawing
 		/// </summary>
 		public ICaptureDetails CaptureDetails { get; set; }
 
+		/// <summary>
+		/// Adjust UI elements to the supplied DPI settings
+		/// </summary>
+		/// <param name="dpi"></param>
+		public void AdjustToDpi(uint dpi)
+		{
+			foreach (var element in this._elements) {
+				element.AdjustToDpi(dpi);
+			}
+		}
+
 		/// <summary>
 		/// Base Surface constructor
 		/// </summary>

Greenshot/Forms/ImageEditorForm.cs

@@ -101,6 +101,8 @@ namespace Greenshot {
 			destinationsToolStrip.ImageScalingSize = newSize;
 			propertiesToolStrip.ImageScalingSize = newSize;
 			propertiesToolStrip.MinimumSize = new Size(150, newSize.Height + 10);
+
+			_surface.AdjustToDpi(dpi);
 		}
 
 		public ImageEditorForm(ISurface iSurface, bool outputMade)

GreenshotPlugin/Interfaces/Drawing/Adorners/IAdorner.cs

@@ -87,5 +87,11 @@ namespace GreenshotPlugin.Interfaces.Drawing.Adorners
 		/// </summary>
 		/// <param name="matrix">Matrix</param>
 		void Transform(Matrix matrix);
+
+		/// <summary>
+		/// Adjust UI elements to the supplied DPI settings
+		/// </summary>
+		/// <param name="dpi"></param>
+		void AdjustToDpi(uint dpi);
 	}
 }

GreenshotPlugin/Interfaces/Drawing/Container.cs

@@ -120,6 +120,12 @@ namespace GreenshotPlugin.Interfaces.Drawing
 		/// Available adorners for the DrawableContainer
 		/// </summary>
 		IList<IAdorner> Adorners { get; }
+
+		/// <summary>
+		/// Adjust UI elements to the supplied DPI settings
+		/// </summary>
+		/// <param name="dpi"></param>
+		void AdjustToDpi(uint dpi);
 	}
 
 	public interface IDrawableContainerList : IList<IDrawableContainer>, IDisposable
@@ -167,6 +173,7 @@ namespace GreenshotPlugin.Interfaces.Drawing
 		void PushElementsToBottom(IDrawableContainerList elements);
 		void ShowContextMenu(MouseEventArgs e, ISurface surface);
 		void HandleFieldChangedEvent(object sender, FieldChangedEventArgs e);
+		void AdjustToDpi(uint dpi);
 	}
 
 	public interface ITextContainer : IDrawableContainer