First attempt at resizable panes

cmd/micro/actions.go

@@ -62,13 +62,21 @@ func (v *View) MousePress(usePlugin bool, e *tcell.EventMouse) bool {
 		return false
 	}
 
-	x, y := e.Position()
-	x -= v.lineNumOffset - v.leftCol + v.x
-	y += v.Topline - v.y
+	rawX, rawY := e.Position()
+
+	x := rawX - v.lineNumOffset - v.leftCol + v.x
+	y := rawY + v.Topline - v.y
 
 	// This is usually bound to left click
+	if !(rawX == v.x+v.Width || rawY == v.y+v.Height || v.resizeX || v.resizeY) {
 		v.MoveToMouseClick(x, y)
+	}
 	if v.mouseReleased {
+		if rawX == v.x+v.Width {
+			v.resizeX = true
+		} else if rawY == v.y+v.Height {
+			v.resizeY = true
+		} else {
 			if len(v.Buf.cursors) > 1 {
 				for i := 1; i < len(v.Buf.cursors); i++ {
 					v.Buf.cursors[i] = nil
@@ -107,9 +115,18 @@ func (v *View) MousePress(usePlugin bool, e *tcell.EventMouse) bool {
 				v.Cursor.CurSelection[0] = v.Cursor.Loc
 				v.Cursor.CurSelection[1] = v.Cursor.Loc
 			}
+		}
 		v.mouseReleased = false
 	} else if !v.mouseReleased {
-		if v.tripleClick {
+		if v.resizeX {
+			v.Width = rawX - v.x
+			v.LockWidth = true
+			v.splitNode.parent.ResizeSplits()
+		} else if v.resizeY {
+			v.Height = rawY - v.y
+			v.LockHeight = true
+			v.splitNode.parent.ResizeSplits()
+		} else if v.tripleClick {
 			v.Cursor.AddLineToSelection()
 		} else if v.doubleClick {
 			v.Cursor.AddWordToSelection()

cmd/micro/cellview.go

@@ -112,6 +112,9 @@ func (c *CellView) Draw(buf *Buffer, top, height, left, width int) {
 		// We'll either draw the length of the line, or the width of the screen
 		// whichever is smaller
 		lineLength := min(StringWidth(lineStr, tabsize), width)
+		if lineLength < 0 {
+			return
+		}
 		c.lines = append(c.lines, make([]*Char, lineLength))
 
 		wrap := false
@@ -133,40 +136,52 @@ func (c *CellView) Draw(buf *Buffer, top, height, left, width int) {
 			char := line[colN]
 
 			if viewCol >= 0 {
+				if viewCol < len(c.lines[viewLine]) {
 					c.lines[viewLine][viewCol] = &Char{Loc{viewCol, viewLine}, Loc{colN, lineN}, char, char, curStyle, 1}
 				}
+			}
 			if char == '\t' {
 				charWidth := tabsize - (viewCol+left)%tabsize
 				if viewCol >= 0 {
+					if viewCol < len(c.lines[viewLine]) {
 						c.lines[viewLine][viewCol].drawChar = indentchar
 						c.lines[viewLine][viewCol].width = charWidth
+					}
 
 					indentStyle := curStyle
 					if group, ok := colorscheme["indent-char"]; ok {
 						indentStyle = group
 					}
 
+					if viewCol < len(c.lines[viewLine]) {
 						c.lines[viewLine][viewCol].style = indentStyle
 					}
+				}
 
 				for i := 1; i < charWidth; i++ {
 					viewCol++
 					if viewCol >= 0 && viewCol < lineLength {
+						if viewCol < len(c.lines[viewLine]) {
 							c.lines[viewLine][viewCol] = &Char{Loc{viewCol, viewLine}, Loc{colN, lineN}, char, ' ', curStyle, 1}
 						}
 					}
+				}
 				viewCol++
 			} else if runewidth.RuneWidth(char) > 1 {
 				charWidth := runewidth.RuneWidth(char)
 				if viewCol >= 0 {
+					if viewCol < len(c.lines[viewLine]) {
 						c.lines[viewLine][viewCol].width = charWidth
 					}
+				}
 				for i := 1; i < charWidth; i++ {
 					viewCol++
 					if viewCol >= 0 && viewCol < lineLength {
+						if viewCol < len(c.lines[viewLine]) {
 							c.lines[viewLine][viewCol] = &Char{Loc{viewCol, viewLine}, Loc{colN, lineN}, char, ' ', curStyle, 1}
 						}
 					}
+				}
 				viewCol++
 			} else {
 				viewCol++

cmd/micro/micro.go

@@ -476,7 +476,7 @@ func main() {
 							// We loop through each view in the current tab and make sure the current view
 							// is the one being clicked in
 							for _, v := range tabs[curTab].views {
-								if x >= v.x && x < v.x+v.Width && y >= v.y && y < v.y+v.Height {
+								if x > v.x && x <= v.x+v.Width && y > v.y && y <= v.y+v.Height {
 									tabs[curTab].CurView = v.Num
 								}
 							}

cmd/micro/view.go

@@ -91,6 +91,9 @@ type View struct {
 	cellview *CellView
 
 	splitNode *LeafNode
+
+	resizeX bool
+	resizeY bool
 }
 
 // NewView returns a new fullscreen view
@@ -599,6 +602,10 @@ func (v *View) HandleEvent(event tcell.Event) {
 			// Mouse event with no click
 			if !v.mouseReleased {
 				// Mouse was just released
+				if v.resizeX || v.resizeY {
+					v.resizeX = false
+					v.resizeY = false
+				} else {
 
 					x, y := e.Position()
 					x -= v.lineNumOffset - v.leftCol + v.x
@@ -615,6 +622,7 @@ func (v *View) HandleEvent(event tcell.Event) {
 						v.Cursor.SetSelectionEnd(v.Cursor.Loc)
 						v.Cursor.CopySelection("primary")
 					}
+				}
 				v.mouseReleased = true
 			}
 		}