From 2898ff05abdd29e6a1842aa53a4e15024e382ed1 Mon Sep 17 00:00:00 2001
From: Stefan Salewski <mail@ssalewski.de>
Date: Fri, 3 Jan 2020 19:22:40 +0100
Subject: [PATCH] added spinbutton.nim

---
 README.adoc                  | 53 ++++++++++++++++++++++++++++++++++++
 examples/gtk3/spinbutton.nim | 42 ++++++++++++++++++++++++++++
 2 files changed, 95 insertions(+)
 create mode 100644 examples/gtk3/spinbutton.nim

diff --git a/README.adoc b/README.adoc
index 9d3c7db..720f040 100644
--- a/README.adoc
+++ b/README.adoc
@@ -687,6 +687,59 @@ an illegal CSS statement -- if the statement is seriously wrong, then you should
 loadFromData().
 
 
+== SpinButton
+
+This widget is used for entering numerical values. We can type in the value with the keyboard, click on the
++/- symbols or use the scroll wheel of the mouse. This example also shows that we can use vertical or horizontal
+orientation for this widget, and how we can use bindProperty() to bind a property of one widget to another widget.
+Here we use a button to control wrapping behaviour of the spin buttons.
+
+[[spinbutton.nim]]
+[source,nim]
+.spinbutton.nim
+----
+##  https://github.com/GNOME/gtk/blob/gtk-3-24/tests/testspinbutton.c
+##  gcc `pkg-config gtk+-3.0 --cflags` spinbutton.c -o spinbutton `pkg-config --libs gtk+-3.0`
+
+import gintro/[gtk, gdk, glib, gobject]
+
+var numWindows: int
+
+proc onDeleteEvent(w: gtk.Window; event: gdk.Event): bool =
+  dec(numWindows)
+  if numWindows == 0:
+    gtk.mainQuit()
+  return EVENT_PROPAGATE # false
+
+proc prepareWindowForOrientation(orientation: gtk.Orientation) =
+  let window = newWindow()
+  discard connect(window, "delete_event", onDeleteEvent)
+  let mainbox = gtk.newBox(if orientation == gtk.Orientation.horizontal: Orientation.vertical else: Orientation.horizontal, 2)
+  window.add(mainbox)
+  let wrapButton = newToggleButtonWithLabel("Wrap")
+  mainbox.add(wrapButton)
+  var max = 0
+  while max <= 999999999:
+    let adj = newAdjustment(max.float, 1, max.float, 1, (max.float + 1) * 0.1, 0)
+    let spin = newSpinButton(adj, 1, 0)
+    spin.setOrientation(orientation)
+    spin.setHalign(gtk.Align.center)
+    discard bindProperty(wrapButton, "active", spin, "wrap", {BindingFlag.syncCreate})
+    let hbox = newBox(gtk.Orientation.horizontal, 2)
+    hbox.packStart(spin, false, false, 2)
+    mainbox.add(hbox)
+    max = max * 10 + 9
+  window.showAll()
+  inc(numWindows)
+
+proc main =
+  gtk.init()
+  prepareWindowForOrientation(gtk.Orientation.horizontal)
+  prepareWindowForOrientation(gtk.Orientation.vertical)
+  gtk.main()
+
+main()
+----
 
 == GTK Builder -- user interfaces created with the glade tool 
 
diff --git a/examples/gtk3/spinbutton.nim b/examples/gtk3/spinbutton.nim
new file mode 100644
index 0000000..95bf9c8
--- /dev/null
+++ b/examples/gtk3/spinbutton.nim
@@ -0,0 +1,42 @@
+##  https://github.com/GNOME/gtk/blob/gtk-3-24/tests/testspinbutton.c
+##  gcc `pkg-config gtk+-3.0 --cflags` spinbutton.c -o spinbutton `pkg-config --libs gtk+-3.0`
+
+import gintro/[gtk, gdk, glib, gobject]
+
+var numWindows: int
+
+proc onDeleteEvent(w: gtk.Window; event: gdk.Event): bool =
+  dec(numWindows)
+  if numWindows == 0:
+    gtk.mainQuit()
+  return EVENT_PROPAGATE # false
+
+proc prepareWindowForOrientation(orientation: gtk.Orientation) =
+  let window = newWindow()
+  discard connect(window, "delete_event", onDeleteEvent)
+  let mainbox = gtk.newBox(if orientation == gtk.Orientation.horizontal: Orientation.vertical else: Orientation.horizontal, 2)
+  window.add(mainbox)
+  let wrapButton = newToggleButtonWithLabel("Wrap")
+  mainbox.add(wrapButton)
+  var max = 0
+  while max <= 999999999:
+    let adj = newAdjustment(max.float, 1, max.float, 1, (max.float + 1) * 0.1, 0)
+    let spin = newSpinButton(adj, 1, 0)
+    spin.setOrientation(orientation)
+    spin.setHalign(gtk.Align.center)
+    discard bindProperty(wrapButton, "active", spin, "wrap", {BindingFlag.syncCreate})
+    let hbox = newBox(gtk.Orientation.horizontal, 2)
+    hbox.packStart(spin, false, false, 2)
+    mainbox.add(hbox)
+    max = max * 10 + 9
+  window.showAll()
+  inc(numWindows)
+
+proc main =
+  gtk.init()
+  prepareWindowForOrientation(gtk.Orientation.horizontal)
+  prepareWindowForOrientation(gtk.Orientation.vertical)
+  gtk.main()
+
+main()
+