Added Label and implemented it on all platforms.

redo/controls.go

@@ -38,7 +38,7 @@ type Checkbox interface {
 	// TODO change to OnToggled() or OnChecked()?
 	OnClicked(func())
 
-	// Text and SetText are Requests that get and set the Checkbox's label text.
+	// Text and SetText get and set the Checkbox's label text.
 	Text() string
 	SetText(text string)
 
@@ -73,3 +73,28 @@ func NewTextField() TextField {
 func NewPasswordField() TextField {
 	return newPasswordField()
 }
+
+
+// Label is a Control that shows a static line of text.
+// Label shows one line of text; any text that does not fit is truncated.
+// A Label can either have smart vertical alignment relative to the control to its right or just be vertically aligned to the top (standalone).
+type Label interface {
+	Control
+
+	// Text and SetText get and set the Label's text.
+	Text() string
+	SetText(text string)
+}
+
+// NewLabel creates a new Label with the given text.
+// The Label will smartly vertically position itself relative to the control to its immediate right.
+// TODO Grids on GTK+ will not respect this unless SetFilling()
+func NewLabel(text string) Label {
+	return newLabel(text)
+}
+
+// NewStandaloneLabel creates a new Label with the given text.
+// The Label will be vertically positioned at the top of its allocated space.
+func NewStandaloneLabel(text string) Label {
+	return newStandaloneLabel(text)
+}

redo/controls_darwin.go

@@ -101,16 +101,18 @@ type textField struct {
 	*widgetbase
 }
 
-func newTextField() *textField {
+func finishNewTextField(id C.id) *textField {
 	return &textField{
-		widgetbase:	newWidget(C.newTextField()),
+		widgetbase:	newWidget(id),
 	}
 }
 
+func newTextField() *textField {
+	return finishNewTextField(C.newTextField())
+}
+
 func newPasswordField() *textField {
-	return &textField{
-		widgetbase:	newWidget(C.newPasswordField()),
-	}
+	return finishNewTextField(C.newPasswordField())
 }
 
 func (t *textField) Text() string {
@@ -122,3 +124,28 @@ func (t *textField) SetText(text string) {
 	defer C.free(unsafe.Pointer(ctext))
 	C.textFieldSetText(t.id, ctext)
 }
+
+// cheap trick
+type label struct {
+	*textField
+	standalone	bool
+}
+
+func finishNewLabel(text string, standalone bool) *label {
+	l := &label{
+		textField:		finishNewTextField(C.newLabel()),
+		standalone:	standalone,
+	}
+	l.SetText(text)
+	return l
+}
+
+func newLabel(text string) Label {
+	return finishNewLabel(text, false)
+}
+
+func newStandaloneLabel(text string) Label {
+	return finishNewLabel(text, true)
+}
+
+// TODO label commitResize

redo/controls_darwin.m

@@ -101,17 +101,20 @@ void checkboxSetChecked(id c, BOOL checked)
 	[toNSButton(c) setState:state];
 }
 
-static id finishNewTextField(NSTextField *t)
+static id finishNewTextField(NSTextField *t, BOOL bordered)
 {
-	// same for text fields and password fields
+	// same for text fields, password fields, and labels
 	setStandardControlFont((id) t);
-	// TODO border (Interface Builder setting is confusing)
+	// TODO text field/password field border (Interface Builder setting is confusing)
+	if (!bordered)
+		[t setBordered:NO];
 	// smart quotes and other autocorrect features are handled by the window; see newWindow() in window_darwin.m for details
 	// Interface Builder does this to make the text box behave properly
 	// this disables both word wrap AND ellipsizing in one fell swoop
 	// however, we need to send it to the control's cell, not to the control directly
 	[[t cell] setLineBreakMode:NSLineBreakByClipping];
 	// Interface Builder also sets this to allow horizontal scrolling
+	// it also sets this for labels, despite those not being scrollable
 	[[t cell] setScrollable:YES];
 	return (id) t;
 }
@@ -121,7 +124,7 @@ id newTextField(void)
 	NSTextField *t;
 
 	t = [[NSTextField alloc] initWithFrame:NSMakeRect(0, 0, 100, 100)];
-	return finishNewTextField(t);
+	return finishNewTextField(t, YES);
 }
 
 id newPasswordField(void)
@@ -129,7 +132,7 @@ id newPasswordField(void)
 	NSSecureTextField *t;
 
 	t = [[NSSecureTextField alloc] initWithFrame:NSMakeRect(0, 0, 100, 100)];
-	return finishNewTextField(toNSTextField(t));
+	return finishNewTextField(toNSTextField(t), YES);
 }
 
 const char *textFieldText(id t)
@@ -141,3 +144,14 @@ void textFieldSetText(id t, char *text)
 {
 	[toNSTextField(t) setStringValue:[NSString stringWithUTF8String:text]];
 }
+
+id newLabel(void)
+{
+	NSTextField *l;
+
+	l = [[NSTextField alloc] initWithFrame:NSMakeRect(0, 0, 100, 100)];
+	[l setEditable:NO];
+	[l setSelectable:NO];
+	[l setDrawsBackground:NO];
+	return finishNewTextField(l, NO);
+}

redo/controls_unix.go

@@ -13,6 +13,9 @@ import (
 // extern void checkboxToggled(GtkToggleButton *, gpointer);
 import "C"
 
+// TODOs:
+// - standalone label on its own: should it be centered or not?
+
 type widgetbase struct {
 	widget	*C.GtkWidget
 }
@@ -153,3 +156,53 @@ func (t *textField) SetText(text string) {
 	defer freegstr(ctext)
 	C.gtk_entry_set_text(t.entry, ctext)
 }
+
+type label struct {
+	*widgetbase
+	misc			*C.GtkMisc
+	label			*C.GtkLabel
+	standalone	bool
+}
+
+func finishNewLabel(text string, standalone bool) *label {
+	ctext := togstr(text)
+	defer freegstr(ctext)
+	widget := C.gtk_label_new(ctext)
+	return &label{
+		widgetbase:	newWidget(widget),
+		misc:		(*C.GtkMisc)(unsafe.Pointer(widget)),
+		label:		(*C.GtkLabel)(unsafe.Pointer(widget)),
+		standalone:	standalone,
+	}
+}
+
+func newLabel(text string) Label {
+	return finishNewLabel(text, false)
+}
+
+func newStandaloneLabel(text string) Label {
+	return finishNewLabel(text, true)
+}
+
+func (l *label) Text() string {
+	return fromgstr(C.gtk_label_get_text(l.label))
+}
+
+func (l *label) SetText(text string) {
+	ctext := togstr(text)
+	defer freegstr(ctext)
+	C.gtk_label_set_text(l.label, ctext)
+}
+
+func (l *label) commitResize(c *allocation, d *sizing) {
+	if !l.standalone && c.neighbor != nil {
+		c.neighbor.getAuxResizeInfo(d)
+		if d.shouldVAlignTop {
+			// TODO should it be center-aligned to the first line or not
+			C.gtk_misc_set_alignment(l.misc, 0, 0)
+		} else {
+			C.gtk_misc_set_alignment(l.misc, 0, 0.5)
+		}
+	}
+	l.widgetbase.commitResize(c, d)
+}

redo/controls_windows.go

@@ -157,3 +157,43 @@ func (t *textField) Text() string {
 func (t *textField) SetText(text string) {
 	t.settext(text)
 }
+
+type label struct {
+	*widgetbase
+	standalone	bool
+}
+
+var labelclass = toUTF16("STATIC")
+
+func finishNewLabel(text string, standalone bool) *label {
+	w := newWidget(labelclass,
+		// SS_NOPREFIX avoids accelerator translation; SS_LEFTNOWORDWRAP clips text past the end
+		// controls are vertically aligned to the top by default (thanks Xeek in irc.freenode.net/#winapi)
+		C.SS_NOPREFIX | C.SS_LEFTNOWORDWRAP,
+		0)
+	C.setWindowText(w.hwnd, toUTF16(text))
+	C.controlSetControlFont(w.hwnd)
+	l := &label{
+		widgetbase:	w,
+		standalone:	standalone,
+	}
+	return l
+}
+
+func newLabel(text string) Label {
+	return finishNewLabel(text, false)
+}
+
+func newStandaloneLabel(text string) Label {
+	return finishNewLabel(text, true)
+}
+
+func (l *label) Text() string {
+	return l.text()
+}
+
+func (l *label) SetText(text string) {
+	l.settext(text)
+}
+
+// TODO label commitResize

redo/objc_darwin.h

@@ -46,6 +46,7 @@ extern id newTextField(void);
 extern id newPasswordField(void);
 extern const char *textFieldText(id);
 extern void textFieldSetText(id, char *);
+extern id newLabel(void);
 
 /* sizing_darwin.m */
 extern void moveControl(id, intptr_t, intptr_t, intptr_t, intptr_t);

redo/sizing_unix.go

@@ -50,19 +50,6 @@ func (w *widgetbase) allocate(x int, y int, width int, height int, d *sizing) []
 }
 
 func (w *widgetbase) commitResize(c *allocation, d *sizing) {
-// TODO
-/*
-	if s.ctype == c_label && !s.alternate && c.neighbor != nil {
-		c.neighbor.getAuxResizeInfo(d)
-		if d.shouldVAlignTop {
-			// TODO should it be center-aligned to the first line or not
-			gtk_misc_set_alignment(s.widget, 0, 0)
-		} else {
-			gtk_misc_set_alignment(s.widget, 0, 0.5)
-		}
-	}
-*/
-
 	// as we resize on size-allocate, we have to also use size-allocate on our children
 	// this is fine anyway; in fact, this allows us to move without knowing what the container is!
 	// this is what GtkBox does anyway

redo/zz_test.go

@@ -28,6 +28,7 @@ var ddata = []dtype{
 type testwin struct {
 	t		Tab
 	w		Window
+	l		Label
 	table		Table
 	b		Button
 	c		Checkbox
@@ -47,6 +48,8 @@ func (tw *testwin) make(done chan struct{}) {
 		done <- struct{}{}
 		return true
 	})
+	tw.l = NewStandaloneLabel("hello")
+	tw.t.Append("Label", tw.l)
 	tw.table = NewTable(reflect.TypeOf(ddata[0]))
 	tw.table.Lock()
 	dq := tw.table.Data().(*[]dtype)