And wrote a new, simpler drawtext example. Now to debug run-time issues in the new attributed string code! First up: some infinite loop.

examples/CMakeLists.txt

@@ -31,12 +31,10 @@ if(NOT WIN32)
 	target_link_libraries(cpp-multithread pthread)
 endif()
 
-_add_example(opentype
-	opentype/main.c
+_add_example(drawtext
+	drawtext/main.c
 	${_EXAMPLE_RESOURCES_RC}
 )
-target_include_directories(opentype
-	PRIVATE opentype)
 
 add_custom_target(examples
 	DEPENDS

examples/drawtext/main.c

@@ -0,0 +1,158 @@
+// 10 march 2018
+#include <stdio.h>
+#include <string.h>
+#include "../../ui.h"
+
+uiWindow *mainwin;
+uiArea *area;
+uiAreaHandler handler;
+uiFontButton *fontButton;
+
+uiAttributedString *attrstr;
+
+#define margins 20
+
+static void appendWithAttribute(const char *what, uiAttribute *attr)
+{
+	size_t start, end;
+
+	start = uiAttributedStringLen(attrstr);
+	end = start + strlen(what);
+	uiAttributedStringAppendUnattributed(attrstr, what);
+	uiAttributedStringSetAttribute(attrstr, attr, start, end);
+}
+
+static void makeAttributedString(void)
+{
+	uiAttribute *attr;
+
+	attrstr = uiNewAttributedString(
+		"Drawing strings with libui is done with the uiAttributedString and uiDrawTextLayout obects.\n"
+		"uiAttributedString lets you have a variety of attributes: ");
+
+	attr = uiNewFamilyAttribute("Courier New");
+	appendWithAttribute("font family", attr);
+	uiAttributedStringAppendUnattributed(attrstr, ", ");
+
+	attr = uiNewSizeAttribute(18);
+	appendWithAttribute("font size", attr);
+	uiAttributedStringAppendUnattributed(attrstr, ", ");
+
+	attr = uiNewWeightAttribute(uiTextWeightBold);
+	appendWithAttribute("font weight", attr);
+	uiAttributedStringAppendUnattributed(attrstr, ", ");
+
+	attr = uiNewItalicAttribute(uiTextItalicItalic);
+	appendWithAttribute("font italicness", attr);
+	uiAttributedStringAppendUnattributed(attrstr, ", ");
+
+	attr = uiNewStretchAttribute(uiTextStretchCondensed);
+	appendWithAttribute("font stretch", attr);
+	uiAttributedStringAppendUnattributed(attrstr, ", ");
+
+	attr = uiNewColorAttribute(0.75, 0.25, 0.5, 0.75);
+	appendWithAttribute("text color", attr);
+	uiAttributedStringAppendUnattributed(attrstr, ", ");
+
+	attr = uiNewBackgroundAttribute(0.5, 0.5, 0.25, 0.5);
+	appendWithAttribute("text background color", attr);
+	uiAttributedStringAppendUnattributed(attrstr, ", ");
+}
+
+static void handlerDraw(uiAreaHandler *a, uiArea *area, uiAreaDrawParams *p)
+{
+	uiDrawTextLayout *textLayout;
+	uiFontDescriptor fontdesc;
+	uiDrawTextLayoutParams params;
+
+	params.String = attrstr;
+	uiFontButtonFont(fontButton, &fontdesc);
+	params.Width = p->AreaWidth - (2 * margins);
+	params.Align = uiDrawTextAlignLeft;
+	textLayout = uiDrawNewTextLayout(&params);
+	// TODO clip to margins
+	uiDrawText(p->Context, textLayout, margins, margins);
+	uiDrawFreeTextLayout(textLayout);
+}
+
+static void handlerMouseEvent(uiAreaHandler *a, uiArea *area, uiAreaMouseEvent *e)
+{
+	// do nothing
+}
+
+static void handlerMouseCrossed(uiAreaHandler *ah, uiArea *a, int left)
+{
+	// do nothing
+}
+
+static void handlerDragBroken(uiAreaHandler *ah, uiArea *a)
+{
+	// do nothing
+}
+
+static int handlerKeyEvent(uiAreaHandler *ah, uiArea *a, uiAreaKeyEvent *e)
+{
+	// reject all keys
+	return 0;
+}
+
+static int onClosing(uiWindow *w, void *data)
+{
+	uiControlDestroy(uiControl(mainwin));
+	uiQuit();
+	return 0;
+}
+
+static int shouldQuit(void *data)
+{
+	uiControlDestroy(uiControl(mainwin));
+	return 1;
+}
+
+int main(void)
+{
+	uiInitOptions o;
+	const char *err;
+	uiBox *hbox, *vbox;
+
+	handler.Draw = handlerDraw;
+	handler.MouseEvent = handlerMouseEvent;
+	handler.MouseCrossed = handlerMouseCrossed;
+	handler.DragBroken = handlerDragBroken;
+	handler.KeyEvent = handlerKeyEvent;
+
+	memset(&o, 0, sizeof (uiInitOptions));
+	err = uiInit(&o);
+	if (err != NULL) {
+		fprintf(stderr, "error initializing ui: %s\n", err);
+		uiFreeInitError(err);
+		return 1;
+	}
+
+	uiOnShouldQuit(shouldQuit, NULL);
+
+	makeAttributedString();
+
+	mainwin = uiNewWindow("libui Histogram Example", 640, 480, 1);
+	uiWindowSetMargined(mainwin, 1);
+	uiWindowOnClosing(mainwin, onClosing, NULL);
+
+	hbox = uiNewHorizontalBox();
+	uiBoxSetPadded(hbox, 1);
+	uiWindowSetChild(mainwin, uiControl(hbox));
+
+	vbox = uiNewVerticalBox();
+	uiBoxSetPadded(vbox, 1);
+	uiBoxAppend(hbox, uiControl(vbox), 0);
+
+	fontButton = uiNewFontButton();
+	uiBoxAppend(vbox, uiControl(fontButton), 0);
+
+	area = uiNewArea(&handler);
+	uiBoxAppend(hbox, uiControl(area), 1);
+
+	uiControlShow(uiControl(mainwin));
+	uiMain();
+	uiUninit();
+	return 0;
+}

ui_attrstr.h

@@ -433,6 +433,7 @@ typedef struct uiDrawTextLayout uiDrawTextLayout;
 
 // uiDrawTextAlign specifies the alignment of lines of text in a
 // uiDrawTextLayout.
+// TODO should this really have Draw in the name?
 _UI_ENUM(uiDrawTextAlign) {
 	uiDrawTextAlignLeft,
 	uiDrawTextAlignCenter,