From 53290919c873f319ce8eb0a40147c62fdfd147f6 Mon Sep 17 00:00:00 2001
From: Zachary Yedidia <zyedidia@gmail.com>
Date: Sat, 26 Mar 2016 16:32:19 -0400
Subject: [PATCH] Detect double and triple clicks

---
 src/cursor.go | 19 +++++++++++++++++++
 src/micro.go  |  5 +++--
 src/view.go   | 52 ++++++++++++++++++++++++++++++++++++++++++++++++---
 3 files changed, 71 insertions(+), 5 deletions(-)

diff --git a/src/cursor.go b/src/cursor.go
index c7435b62..cdfcafe4 100644
--- a/src/cursor.go
+++ b/src/cursor.go
@@ -90,6 +90,25 @@ func (c *Cursor) GetSelection() string {
 	return string([]rune(c.v.buf.text)[c.selectionStart : c.selectionEnd+1])
 }
 
+// SelectLine selects the current line
+func (c *Cursor) SelectLine() {
+	c.Start()
+	c.selectionStart = c.Loc()
+	c.End()
+	c.selectionEnd = c.Loc()
+}
+
+// AddLineToSelection adds the current line to the selection
+func (c *Cursor) AddLineToSelection() {
+	if c.loc < c.selectionStart {
+		c.Start()
+		c.selectionStart = c.Loc()
+	} else if c.loc > c.selectionEnd {
+		c.End()
+		c.selectionEnd = c.Loc()
+	}
+}
+
 // RuneUnder returns the rune under the cursor
 func (c *Cursor) RuneUnder() rune {
 	line := c.v.buf.lines[c.y]
diff --git a/src/micro.go b/src/micro.go
index 6c5abe0a..e3df3c7a 100644
--- a/src/micro.go
+++ b/src/micro.go
@@ -10,8 +10,9 @@ import (
 )
 
 const (
-	synLinesUp   = 75 // How many lines up to look to do syntax highlighting
-	synLinesDown = 75 // How many lines down to look to do syntax highlighting
+	synLinesUp           = 75  // How many lines up to look to do syntax highlighting
+	synLinesDown         = 75  // How many lines down to look to do syntax highlighting
+	doubleClickThreshold = 400 // How many milliseconds to wait before a second click is not a double click
 )
 
 // The main screen
diff --git a/src/view.go b/src/view.go
index 2884d0cc..c0272d5b 100644
--- a/src/view.go
+++ b/src/view.go
@@ -6,6 +6,7 @@ import (
 	"io/ioutil"
 	"strconv"
 	"strings"
+	"time"
 )
 
 // The View struct stores information about a view into a buffer.
@@ -44,6 +45,17 @@ type View struct {
 	// mouse release events
 	mouseReleased bool
 
+	// This stores when the last click was
+	// This is useful for detecting double and triple clicks
+	lastClickTime time.Time
+
+	// Was the last mouse event actually a double click?
+	// Useful for detecting triple clicks -- if a double click is detected
+	// but the last mouse event was actually a double click, it's a triple click
+	doubleClick bool
+	// Same here, just to keep track for mouse move events
+	tripleClick bool
+
 	// Syntax highlighting matches
 	matches SyntaxMatches
 	// The matches from the last frame
@@ -90,6 +102,7 @@ func NewViewWidthHeight(buf *Buffer, w, h int) *View {
 	// Set mouseReleased to true because we assume the mouse is not being pressed when
 	// the editor is opened
 	v.mouseReleased = true
+	v.lastClickTime = time.Time{}
 
 	return v
 }
@@ -432,14 +445,47 @@ func (v *View) HandleEvent(event tcell.Event) {
 		switch button {
 		case tcell.Button1:
 			// Left click
+			origX, origY := v.cursor.x, v.cursor.y
 			v.MoveToMouseClick(x, y)
 
-			loc := v.cursor.Loc()
 			if v.mouseReleased {
-				v.cursor.selectionStart = loc
+				if (time.Since(v.lastClickTime)/time.Millisecond < doubleClickThreshold) &&
+					(origX == v.cursor.x && origY == v.cursor.y) {
+					if v.doubleClick {
+						// Triple click
+						v.lastClickTime = time.Now()
+						v.tripleClick = true
+						v.doubleClick = false
+						messenger.Error("Triple click")
+						v.cursor.SelectLine()
+					} else {
+						// Double click
+						v.doubleClick = true
+						v.tripleClick = false
+						v.lastClickTime = time.Now()
+						messenger.Error("Double click")
+					}
+				} else {
+					messenger.Error("Single click")
+					v.doubleClick = false
+					v.tripleClick = false
+					v.lastClickTime = time.Now()
+
+					loc := v.cursor.Loc()
+					v.cursor.selectionStart = loc
+					v.cursor.selectionEnd = loc
+				}
+			} else {
+				if v.tripleClick {
+					v.cursor.AddLineToSelection()
+				} else if v.doubleClick {
+
+				} else {
+					v.cursor.selectionEnd = v.cursor.Loc()
+				}
 			}
-			v.cursor.selectionEnd = loc
 			v.mouseReleased = false
+
 		case tcell.ButtonNone:
 			// Mouse event with no click
 			if !v.mouseReleased {