From 9f032a71201e6ad964e46a2a06c4003503b7dd54 Mon Sep 17 00:00:00 2001
From: Mikko Rasa <tdb@tdb.fi>
Date: Fri, 27 Sep 2019 14:27:49 +0300
Subject: [PATCH] Add a progress bar widget

---
 source/panel.cpp       |  2 ++
 source/progressbar.cpp | 63 ++++++++++++++++++++++++++++++++++++++++++
 source/progressbar.h   | 31 +++++++++++++++++++++
 3 files changed, 96 insertions(+)
 create mode 100644 source/progressbar.cpp
 create mode 100644 source/progressbar.h

diff --git a/source/panel.cpp b/source/panel.cpp
index b4f4f5f..59c363c 100644
--- a/source/panel.cpp
+++ b/source/panel.cpp
@@ -13,6 +13,7 @@
 #include "list.h"
 #include "panel.h"
 #include "part.h"
+#include "progressbar.h"
 #include "row.h"
 #include "slider.h"
 #include "stack.h"
@@ -225,6 +226,7 @@ Panel::Loader::Loader(Panel &p, map<string, Widget *> &m):
 		register_child_type<Label>("label");
 		register_child_type<List>("list");
 		register_child_type<Panel>("panel");
+		register_child_type<ProgressBar>("progressbar");
 		register_child_type<Toggle>("toggle");
 		register_child_type<VSlider>("vslider");
 	}
diff --git a/source/progressbar.cpp b/source/progressbar.cpp
new file mode 100644
index 0000000..aed83c3
--- /dev/null
+++ b/source/progressbar.cpp
@@ -0,0 +1,63 @@
+#include <msp/gl/meshbuilder.h>
+#include "graphic.h"
+#include "part.h"
+#include "progressbar.h"
+
+using namespace std;
+
+namespace Msp {
+namespace GLtk {
+
+ProgressBar::ProgressBar():
+	range(1),
+	fraction(0)
+{ }
+
+void ProgressBar::set_range(float r)
+{
+	if(r<=0)
+		throw invalid_argument("ProgressBar::set_range");
+
+	range = r;
+	mark_rebuild();
+}
+
+void ProgressBar::set_value(float v)
+{
+	if(v<0 || v>range)
+		throw invalid_argument("ProgressBar::set_value");
+
+	fraction = v/range;
+	mark_rebuild();
+}
+
+void ProgressBar::autosize_special(const Part &part, Geometry &ageom) const
+{
+	const Geometry &pgeom = part.get_geometry();
+	const Sides &pmargin = part.get_margin();
+	ageom.w = max(ageom.w, pgeom.w+pmargin.left+pmargin.right);
+	ageom.h = max(ageom.h, pgeom.h+pmargin.top+pmargin.bottom);
+}
+
+void ProgressBar::rebuild_special(const Part &part)
+{
+	if(part.get_name()=="bar")
+	{
+		const Graphic *graphic = part.get_graphic(state);
+		if(!graphic || !graphic->get_texture())
+			return;
+
+		Geometry rgeom = part.get_geometry();
+		Alignment align = part.get_alignment();
+		align.w += (1-align.w)*fraction;
+		align.h += (1-align.h)*fraction;
+		align.apply(rgeom, geom, part.get_margin());
+
+		GL::MeshBuilder bld(part_cache.create_mesh(part, *graphic->get_texture()));
+		bld.matrix() *= GL::Matrix::translation(rgeom.x, rgeom.y, 0);
+		graphic->build(rgeom.w, rgeom.h, bld);
+	}
+}
+
+} // namespace GLtk
+} // namespace Msp
diff --git a/source/progressbar.h b/source/progressbar.h
new file mode 100644
index 0000000..c1e17b5
--- /dev/null
+++ b/source/progressbar.h
@@ -0,0 +1,31 @@
+#ifndef MSP_GLTK_PROGRESSBAR_H_
+#define MSP_GLTK_PROGRESSBAR_H_
+
+#include "widget.h"
+
+namespace Msp {
+namespace GLtk {
+
+class ProgressBar: public Widget
+{
+private:
+	float range;
+	float fraction;
+
+public:
+	ProgressBar();
+
+	virtual const char *get_class() const { return "progressbar"; }
+
+	void set_range(float);
+	void set_value(float);
+
+private:
+	virtual void autosize_special(const Part &, Geometry &) const;
+	virtual void rebuild_special(const Part &);
+};
+
+} // namespace GLtk
+} // namespace Msp
+
+#endif
-- 
2.43.0