From a038923060f4183ff6d62faa94d2c56e49f52831 Mon Sep 17 00:00:00 2001
From: Pietro Gagliardi <pietro10@mac.com>
Date: Sun, 15 May 2016 21:02:35 -0400
Subject: [PATCH] Added a color well to the histogram example.

---
 darwin/colorbutton.m      |  2 ++
 examples/histogram/main.c | 31 +++++++++++++++++++++++++++++--
 2 files changed, 31 insertions(+), 2 deletions(-)

diff --git a/darwin/colorbutton.m b/darwin/colorbutton.m
index 47f8511e..af6d1faa 100644
--- a/darwin/colorbutton.m
+++ b/darwin/colorbutton.m
@@ -1,6 +1,8 @@
 // 15 may 2016
 #import "uipriv_darwin.h"
 
+// TODO no intrinsic height?
+
 @interface colorButton : NSColorWell {
 	uiColorButton *libui_b;
 	BOOL libui_changing;
diff --git a/examples/histogram/main.c b/examples/histogram/main.c
index 669a9033..f2b0e793 100644
--- a/examples/histogram/main.c
+++ b/examples/histogram/main.c
@@ -9,6 +9,7 @@ uiWindow *mainwin;
 uiArea *histogram;
 uiAreaHandler handler;
 uiSpinbox *datapoints[10];
+uiColorButton *colorButton;
 int currentPoint = -1;
 
 // some metrics
@@ -94,6 +95,7 @@ static void handlerDraw(uiAreaHandler *a, uiArea *area, uiAreaDrawParams *p)
 	uiDrawStrokeParams sp;
 	uiDrawMatrix m;
 	double graphWidth, graphHeight;
+	double graphR, graphG, graphB, graphA;
 
 	// fill the area with white
 	setSolidBrush(&brush, colorWhite, 1.0);
@@ -134,15 +136,23 @@ static void handlerDraw(uiAreaHandler *a, uiArea *area, uiAreaDrawParams *p)
 	uiDrawMatrixTranslate(&m, xoffLeft, yoffTop);
 	uiDrawTransform(p->Context, &m);
 
+	// now get the color for the graph itself and set up the brush
+	uiColorButtonColor(colorButton, &graphR, &graphG, &graphB, &graphA);
+	brush.Type = uiDrawBrushTypeSolid;
+	brush.R = graphR;
+	brush.G = graphG;
+	brush.B = graphB;
+	// we set brush->A below to different values for the fill and stroke
+
 	// now create the fill for the graph below the graph line
 	path = constructGraph(graphWidth, graphHeight, 1);
-	setSolidBrush(&brush, colorDodgerBlue, 0.5);
+	brush.A = graphA / 2;
 	uiDrawFill(p->Context, path, &brush);
 	uiDrawFreePath(path);
 
 	// now draw the histogram line
 	path = constructGraph(graphWidth, graphHeight, 0);
-	setSolidBrush(&brush, colorDodgerBlue, 1.0);
+	brush.A = graphA;
 	uiDrawStroke(p->Context, path, &brush, &sp);
 	uiDrawFreePath(path);
 
@@ -216,6 +226,11 @@ static void onDatapointChanged(uiSpinbox *s, void *data)
 	uiAreaQueueRedrawAll(histogram);
 }
 
+static void onColorChanged(uiColorButton *b, void *data)
+{
+	uiAreaQueueRedrawAll(histogram);
+}
+
 static int onClosing(uiWindow *w, void *data)
 {
 	uiControlDestroy(uiControl(mainwin));
@@ -235,6 +250,7 @@ int main(void)
 	const char *err;
 	uiBox *hbox, *vbox;
 	int i;
+	uiDrawBrush brush;
 
 	handler.Draw = handlerDraw;
 	handler.MouseEvent = handlerMouseEvent;
@@ -272,6 +288,17 @@ int main(void)
 		uiBoxAppend(vbox, uiControl(datapoints[i]), 0);
 	}
 
+	colorButton = uiNewColorButton();
+	// TODO inline these
+	setSolidBrush(&brush, colorDodgerBlue, 1.0);
+	uiColorButtonSetColor(colorButton,
+		brush.R,
+		brush.G,
+		brush.B,
+		brush.A);
+	uiColorButtonOnChanged(colorButton, onColorChanged, NULL);
+	uiBoxAppend(vbox, uiControl(colorButton), 0);
+
 	histogram = uiNewArea(&handler);
 	uiBoxAppend(hbox, uiControl(histogram), 1);