From b49cc8c88caf7d69b35b50e23a40528e71306ade Mon Sep 17 00:00:00 2001
From: Daniel Karbach <daniel.karbach@localhorst.tv>
Date: Tue, 20 Oct 2015 12:11:13 +0200
Subject: [PATCH] uniform background for message box

---
 src/ui/MessageBox.hpp | 10 +++++++++-
 src/ui/Text.hpp       |  2 ++
 src/ui/widgets.cpp    | 36 +++++++++++++++++++++++++++++++++---
 3 files changed, 44 insertions(+), 4 deletions(-)

diff --git a/src/ui/MessageBox.hpp b/src/ui/MessageBox.hpp
index 2191627..b5a82c8 100644
--- a/src/ui/MessageBox.hpp
+++ b/src/ui/MessageBox.hpp
@@ -3,6 +3,7 @@
 
 #include "Text.hpp"
 #include "../graphics/align.hpp"
+#include "../graphics/PrimitiveMesh.hpp"
 
 #include <deque>
 #include <string>
@@ -22,7 +23,7 @@ public:
 	void Position(const glm::vec3 &, Gravity) noexcept;
 
 	void Foreground(const glm::vec4 &col) noexcept { fg = col; }
-	void Background(const glm::vec4 &col) noexcept { bg = col; }
+	void Background(const glm::vec4 &col) noexcept { bg = col; dirty = true; }
 
 	void PushLine(const char *);
 	void PushLine(const std::string &l) {
@@ -31,6 +32,9 @@ public:
 
 	void Render(Viewport &) noexcept;
 
+private:
+	void Recalc();
+
 private:
 	const Font &font;
 	std::deque<Text> lines;
@@ -38,11 +42,15 @@ private:
 
 	glm::vec3 pos;
 	glm::vec3 adv;
+	glm::vec2 size;
 
 	glm::vec4 bg;
 	glm::vec4 fg;
 
+	PrimitiveMesh bg_mesh;
+
 	Gravity grav;
+	bool dirty;
 
 };
 
diff --git a/src/ui/Text.hpp b/src/ui/Text.hpp
index bdeb304..84a6190 100644
--- a/src/ui/Text.hpp
+++ b/src/ui/Text.hpp
@@ -29,6 +29,8 @@ public:
 		dirty = true;
 	}
 
+	const glm::vec2 &Size() const noexcept { return size; }
+
 	void Render(Viewport &) noexcept;
 
 private:
diff --git a/src/ui/widgets.cpp b/src/ui/widgets.cpp
index b19dbcf..533703f 100644
--- a/src/ui/widgets.cpp
+++ b/src/ui/widgets.cpp
@@ -19,7 +19,8 @@ MessageBox::MessageBox(const Font &f)
 , adv(0.0f, font.LineSkip(), 0.0f)
 , bg(1.0f, 1.0f, 1.0f, 0.0f)
 , fg(1.0f, 1.0f, 1.0f, 1.0f)
-, grav(Gravity::NORTH_WEST) {
+, grav(Gravity::NORTH_WEST)
+, dirty(true) {
 
 }
 
@@ -34,6 +35,7 @@ void MessageBox::Position(const glm::vec3 &p, Gravity g) noexcept {
 	for (Text &txt : lines) {
 		txt.Pivot(g);
 	}
+	dirty = true;
 }
 
 void MessageBox::PushLine(const char *text) {
@@ -45,13 +47,41 @@ void MessageBox::PushLine(const char *text) {
 	while (lines.size() > max_lines) {
 		lines.pop_back();
 	}
+	dirty = true;
+}
+
+namespace {
+
+PrimitiveMesh::Buffer bg_buf;
+
+}
+
+void MessageBox::Recalc() {
+	size = glm::vec2(0.0f, 0.0f);
+	for (const Text &line : lines) {
+		size.x = std::max(size.x, line.Size().x);
+		size.y += line.Size().y;
+	}
+	bg_buf.FillRect(size.x, size.y, bg, align(grav, size));
+	bg_mesh.Update(bg_buf);
+	bg_buf.Clear();
+	dirty = false;
 }
 
 void MessageBox::Render(Viewport &viewport) noexcept {
+	viewport.SetCursor(pos, grav);
+	if (bg.a > std::numeric_limits<float>::epsilon()) {
+		if (dirty) {
+			Recalc();
+		}
+		PlainColor &prog = viewport.HUDColorProgram();
+		prog.SetM(viewport.Cursor());
+		bg_mesh.DrawTriangles();
+		viewport.MoveCursor(glm::vec3(0.0f, 0.0f, -1.0f));
+	}
 	BlendedSprite &prog = viewport.SpriteProgram();
-	prog.SetBG(bg);
+	prog.SetBG(glm::vec4(0.0f));
 	prog.SetFG(fg);
-	viewport.SetCursor(pos, grav);
 	for (Text &txt : lines) {
 		prog.SetM(viewport.Cursor());
 		txt.Render(viewport);
-- 
2.39.2