From 562ac8ffe3b3677467054eb971b2230bea2b687f Mon Sep 17 00:00:00 2001
From: Nicolas Peugnet <nicolas@club1.fr>
Date: Sun, 18 Feb 2024 20:17:35 +0100
Subject: [PATCH] Add a custom mouse event wrapper around tcell's one

This wrapper implements the HasMotion() function which value is set by
the main application based on the previous mouse event.
---
 application.go  | 7 ++++++-
 eventhandler.go | 9 +++++++++
 2 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/application.go b/application.go
index fc2d865..b7edf10 100644
--- a/application.go
+++ b/application.go
@@ -38,6 +38,7 @@ type FocusableComponent interface {
 type Application struct {
 	screenLock   sync.RWMutex
 	screen       tcell.Screen
+	prevMouseEvt *tcell.EventMouse
 	root         Component
 	updates      chan interface{}
 	redrawTicker *time.Ticker
@@ -50,6 +51,7 @@ const queueSize = 255
 
 func NewApplication() *Application {
 	return &Application{
+		prevMouseEvt: &tcell.EventMouse{},
 		updates:      make(chan interface{}, queueSize),
 		redrawTicker: time.NewTicker(1 * time.Minute),
 		stop:         make(chan struct{}, 1),
@@ -132,7 +134,10 @@ func (app *Application) Start() error {
 					redraw = app.root.OnPasteEvent(customEvt)
 				}
 			case *tcell.EventMouse:
-				redraw = app.root.OnMouseEvent(event)
+				hasMotion := app.prevMouseEvt.Buttons() == event.Buttons()
+				customEvt := customMouseEvent{event, hasMotion}
+				app.prevMouseEvt = event
+				redraw = app.root.OnMouseEvent(customEvt)
 			case *tcell.EventResize:
 				clear = true
 				redraw = true
diff --git a/eventhandler.go b/eventhandler.go
index 3d45b78..fa04259 100644
--- a/eventhandler.go
+++ b/eventhandler.go
@@ -38,6 +38,15 @@ type PasteEvent interface {
 	Text() string
 }
 
+type customMouseEvent struct {
+	*tcell.EventMouse
+	motion bool
+}
+
+func (cme customMouseEvent) HasMotion() bool {
+	return cme.motion
+}
+
 // MouseEvent is an interface of the *tcell.EventMouse type.
 type MouseEvent interface {
 	tcell.Event