TODO feature: Middle mouse - drag the canvas

McBitFont/FontTester.Designer.cs

@@ -34,8 +34,8 @@
             lblZoom = new System.Windows.Forms.Label();
             cbZoom = new System.Windows.Forms.ComboBox();
             toolTip1 = new System.Windows.Forms.ToolTip(components);
-            chkBaseline = new System.Windows.Forms.CheckBox();
             btnCopy = new System.Windows.Forms.Button();
+            chkBaseline = new System.Windows.Forms.CheckBox();
             ((System.ComponentModel.ISupportInitialize)nudSpace).BeginInit();
             SuspendLayout();
             // 
@@ -99,7 +99,7 @@
             vScroll.LargeChange = 25;
             vScroll.Location = new System.Drawing.Point(251, 84);
             vScroll.Name = "vScroll";
-            vScroll.Size = new System.Drawing.Size(21, 125);
+            vScroll.Size = new System.Drawing.Size(21, 104);
             vScroll.TabIndex = 17;
             vScroll.ValueChanged += Scrolling;
             // 
@@ -141,17 +141,6 @@
             toolTip1.InitialDelay = 500;
             toolTip1.ReshowDelay = 100;
             // 
-            // chkBaseline
-            // 
-            chkBaseline.AutoSize = true;
-            chkBaseline.Location = new System.Drawing.Point(203, 36);
-            chkBaseline.Name = "chkBaseline";
-            chkBaseline.Size = new System.Drawing.Size(69, 19);
-            chkBaseline.TabIndex = 20;
-            chkBaseline.Text = "Baseline";
-            chkBaseline.UseVisualStyleBackColor = true;
-            chkBaseline.CheckedChanged += Scrolling;
-            // 
             // btnCopy
             // 
             btnCopy.Anchor = System.Windows.Forms.AnchorStyles.Bottom;
@@ -167,6 +156,17 @@
             btnCopy.UseVisualStyleBackColor = true;
             btnCopy.MouseClick += Copy_Click;
             // 
+            // chkBaseline
+            // 
+            chkBaseline.AutoSize = true;
+            chkBaseline.Location = new System.Drawing.Point(203, 36);
+            chkBaseline.Name = "chkBaseline";
+            chkBaseline.Size = new System.Drawing.Size(69, 19);
+            chkBaseline.TabIndex = 20;
+            chkBaseline.Text = "Baseline";
+            chkBaseline.UseVisualStyleBackColor = true;
+            chkBaseline.CheckedChanged += Scrolling;
+            // 
             // FontTester
             // 
             AutoScaleDimensions = new System.Drawing.SizeF(7F, 15F);

McBitFont/Form1.Designer.cs

@@ -493,7 +493,10 @@
             // hScroll
             // 
             hScroll.Anchor = System.Windows.Forms.AnchorStyles.Bottom | System.Windows.Forms.AnchorStyles.Left | System.Windows.Forms.AnchorStyles.Right;
+            hScroll.Enabled = false;
+            hScroll.LargeChange = 2;
             hScroll.Location = new System.Drawing.Point(14, 609);
+            hScroll.Maximum = 1;
             hScroll.Name = "hScroll";
             hScroll.Size = new System.Drawing.Size(427, 21);
             hScroll.TabIndex = 14;
@@ -502,8 +505,10 @@
             // vScroll
             // 
             vScroll.Anchor = System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Bottom | System.Windows.Forms.AnchorStyles.Right;
-            vScroll.LargeChange = 25;
+            vScroll.Enabled = false;
+            vScroll.LargeChange = 2;
             vScroll.Location = new System.Drawing.Point(444, 31);
+            vScroll.Maximum = 1;
             vScroll.Name = "vScroll";
             vScroll.Size = new System.Drawing.Size(21, 575);
             vScroll.TabIndex = 15;

McBitFont/Form1.cs

@@ -296,6 +296,7 @@ namespace McBitFont {
             if (w <= dotPanel.Width) {
                 hScroll.Enabled = false;
                 hScroll.Value = 0;
+                vScroll.Maximum = 0;
             } else {
                 hScroll.Maximum = w - dotPanel.Width + 12;
                 hScroll.Minimum = 0;
@@ -305,6 +306,7 @@ namespace McBitFont {
             if (h <= dotPanel.Height) {
                 vScroll.Enabled = false;
                 vScroll.Value = 0;
+                vScroll.Maximum = 0;
             } else {
                 vScroll.Maximum = h - dotPanel.Height + 12;
                 vScroll.Minimum = 0;
@@ -416,10 +418,45 @@ namespace McBitFont {
 
         private bool mouseDown = false;
         private bool fChanged = false;
+        private bool mouseDownMiddle = false;
+        private int mouseX, mouseY;
         private void dotPanel_MouseMove(object sender, MouseEventArgs e) {
             var rectSel = chkRectSelect.Checked;
             bool rectSelUpdated = false;
 
+            // Drag with middle mouse button
+            if (vScroll.Enabled || hScroll.Enabled) {
+                if (mouseDownMiddle) {
+                    var dY = mouseY - e.Y <= -cellSize - gap || mouseY - e.Y >= cellSize + gap;
+                    var dX = mouseX - e.X <= -cellSize - gap || mouseX - e.X >= cellSize + gap;
+                    int newY = vScroll.Value;
+                    int newX = hScroll.Value;
+                    if (dX) {
+                        newX += (mouseX - e.X);
+                        if (newX < hScroll.Minimum) newX = hScroll.Minimum;
+                        if (newX > hScroll.Maximum) newX = hScroll.Maximum;
+                        mouseX = e.X;
+                        hScroll.Value = newX;
+                    }
+                    if (dY) {
+                        newY += (mouseY - e.Y);
+                        if (newY < vScroll.Minimum) newY = vScroll.Minimum;
+                        if (newY > vScroll.Maximum) newY = vScroll.Maximum;
+                        mouseY = e.Y;
+                        vScroll.Value = newY;
+                    }
+                }
+                if (!mouseDownMiddle && e.Button == MouseButtons.Middle) {
+                    mouseDownMiddle = true;
+                    mouseX = e.X;
+                    mouseY = e.Y;
+                }
+                if (mouseDownMiddle && e.Button == MouseButtons.None) {
+                    mouseDownMiddle = false;
+                }
+            }
+            
+
             // Moving baseline
             Rectangle rect1, rect2;
             if (set_base) {

TODO.txt

@@ -3,7 +3,7 @@ Application:
 
 
 Functionality:
-- Middle mouse - drag the canvas
+V Middle mouse - drag the canvas
 - Straight line painting
 V A button to Copy from Test font dialog to then paste into another frame