From d309eb8633be1d9f08d1e9cd9930d68d8b169367 Mon Sep 17 00:00:00 2001
From: Mikko Rasa <tdb@tdb.fi>
Date: Sun, 8 Sep 2019 17:25:56 +0300
Subject: [PATCH] Make the entry widget cursor blink

If the cursor part has different graphics for normal and active states,
it will toggle between those every half a second while the widget is
focused.
---
 source/entry.cpp | 38 ++++++++++++++++++++++++++++++++++++--
 source/entry.h   |  4 ++++
 2 files changed, 40 insertions(+), 2 deletions(-)

diff --git a/source/entry.cpp b/source/entry.cpp
index 8d3c47f..87f88c7 100644
--- a/source/entry.cpp
+++ b/source/entry.cpp
@@ -23,7 +23,8 @@ Entry::Entry(const string &t):
 	visible_rows(1),
 	text_part(0),
 	slider(0),
-	got_key_press(false)
+	got_key_press(false),
+	cursor_blink(true)
 {
 	input_type = INPUT_TEXT;
 	set_text(t);
@@ -92,7 +93,8 @@ void Entry::rebuild_special(const Part &part)
 		text.build(part, state, geom, first_row, part_cache);
 	else if(part.get_name()=="cursor")
 	{
-		const Graphic *graphic = part.get_graphic(state);
+		State cursor_state = (cursor_blink ? ACTIVE : NORMAL);
+		const Graphic *graphic = part.get_graphic(state|cursor_state);
 		if(!text_part || !graphic || !graphic->get_texture())
 			return;
 
@@ -170,10 +172,18 @@ bool Entry::character(wchar_t ch)
 	return false;
 }
 
+void Entry::focus_in()
+{
+	cursor_blink = true;
+	Widget::focus_in();
+	check_cursor_blink();
+}
+
 void Entry::focus_out()
 {
 	Widget::focus_out();
 	got_key_press = false;
+	check_cursor_blink();
 }
 
 bool Entry::navigate(Navigation nav)
@@ -208,6 +218,12 @@ bool Entry::navigate(Navigation nav)
 	return true;
 }
 
+void Entry::animate(const Time::TimeDelta &)
+{
+	cursor_blink = !cursor_blink;
+	rebuild();
+}
+
 void Entry::on_geometry_change()
 {
 	if(multiline)
@@ -228,6 +244,8 @@ void Entry::on_style_change()
 
 	if(multiline)
 		check_view_range();
+
+	check_cursor_blink();
 }
 
 void Entry::set_edit_position(unsigned ep)
@@ -237,6 +255,22 @@ void Entry::set_edit_position(unsigned ep)
 	rebuild();
 }
 
+void Entry::check_cursor_blink()
+{
+	cursor_blink = (state&FOCUS);
+	if((state&FOCUS) && style)
+	{
+		const Part *cursor_part = style->get_part("cursor");
+		if(cursor_part && cursor_part->get_graphic(ACTIVE|FOCUS)!=cursor_part->get_graphic(NORMAL|FOCUS))
+		{
+			set_animation_interval(Time::sec/2);
+			return;
+		}
+	}
+
+	stop_animation();
+}
+
 void Entry::check_view_range()
 {
 	if(!multiline || !text_part)
diff --git a/source/entry.h b/source/entry.h
index a3b1607..cd80ab0 100644
--- a/source/entry.h
+++ b/source/entry.h
@@ -45,6 +45,7 @@ private:
 	const Part *text_part;
 	VSlider *slider;
 	bool got_key_press;
+	bool cursor_blink;
 
 public:
 	Entry(const std::string & = std::string());
@@ -73,13 +74,16 @@ public:
 	virtual void touch_press(int, int, unsigned);
 	virtual bool key_press(unsigned, unsigned);
 	virtual bool character(wchar_t);
+	virtual void focus_in();
 	virtual void focus_out();
 	virtual bool navigate(Navigation);
+	virtual void animate(const Time::TimeDelta &);
 private:
 	virtual void on_geometry_change();
 	virtual void on_style_change();
 
 	void set_edit_position(unsigned);
+	void check_cursor_blink();
 	void check_view_range();
 	void slider_value_changed(double);
 };
-- 
2.45.2