app: define two dialog constructors

Define two new constructor functions for the popup dialog.
DefaultDialog() creates a dialog that spans half of the screen, whereas
the LargeDialog() covers three-quarter of the screen.

If a dialog widget has more specific size requirements, custom window
position and window height functions can be used with NewDialog().

Signed-off-by: Koni Marti <koni.marti@gmail.com>
Acked-by: Robin Jarry <robin@jarry.cc>

1 files changed, 28 insertions, 0 deletions

diff --git a/app/dialog.go b/app/dialog.go
index 8ec6405a..3ed8b469 100644
--- a/app/dialog.go
+++ b/app/dialog.go
@@ -22,3 +22,31 @@ func (d *dialog) ContextHeight() (func(int) int, func(int) int) {
 func NewDialog(d ui.DrawableInteractive, y func(int) int, h func(int) int) Dialog {
 	return &dialog{DrawableInteractive: d, y: y, h: h}
 }
+
+// DefaultDialog creates a dialog window spanning half of the screen
+func DefaultDialog(d ui.DrawableInteractive) Dialog {
+	return NewDialog(d,
+		// vertical starting position in lines from the top
+		func(h int) int {
+			return h / 4
+		},
+		// dialog height from the starting line
+		func(h int) int {
+			return h / 2
+		},
+	)
+}
+
+// LargeDialog creates a dialog window spanning three quarter of the screen
+func LargeDialog(d ui.DrawableInteractive) Dialog {
+	return NewDialog(d,
+		// vertical starting position in lines from the top
+		func(h int) int {
+			return h / 8
+		},
+		// dialog height from the starting line
+		func(h int) int {
+			return 3 * h / 4
+		},
+	)
+}