Demo added

demos/clui_demo.go

@@ -0,0 +1,137 @@
+/*
+The Demo shows how to create Windows with fixed(manual
+layout) and dynamic one. Simple forms are easier to create
+in manual layout(check method createManualView).
+
+Below there are two Windows that look and act the same
+way. The only difference: it is not easy to relocate buttons
+on Window resize in the same way as it is done in Window with
+dynamic layout. So, Buttons in manual layout are moved in
+a bit different way. All other features are the same.
+
+Demo includes:
+    - How to use Control's events (ComboBox and Button ones)
+    - How to create manual layout
+    - How to use Packers
+    - How to intialize and run the application
+    - How to stop the application
+*/
+package main
+
+import (
+	"fmt"
+	ui "github.com/VladimirMarkelov/clui"
+	"strconv"
+)
+
+func updateProgress(value string, pb *ui.ProgressBar) {
+	v, _ := strconv.Atoi(value)
+	pb.SetValue(v)
+}
+
+func createDynamicView(c *ui.Composer) {
+	emptyProp := ui.Props{}
+
+	wnd := c.CreateWindow(1, 15, ui.AutoSize, ui.AutoSize, "Dynamic Layout", emptyProp)
+
+	packMain := wnd.AddPack(ui.PackHorizontal)
+	packLeft := packMain.AddPack(ui.PackVertical, 1)
+	packLeft.SetBorderStyle(ui.BorderSingle)
+
+	packRight := packMain.AddPack(ui.PackVertical, ui.DoNotScale)
+	packRight.SetBorderStyle(ui.BorderDouble)
+	ts := packRight.PackTextScroll(30, 10, 1, ui.Props{})
+
+	// Here are a lot of additional Packers because it is not possible to mix
+	// Packers and Controls inside one Packer
+	packPb := packLeft.AddPack(ui.PackHorizontal, ui.DoNotScale)
+	packPb.SetPaddings(ui.DoNotChange, 1, ui.DoNotChange, ui.DoNotChange)
+	pb := packPb.PackProgressBar(10, 1, 0, 10, 1, emptyProp)
+	packCb := packLeft.AddPack(ui.PackHorizontal, ui.DoNotScale)
+	packCb.PackLabel(22, "Set ProgressBar Value", ui.DoNotScale, emptyProp)
+	cb := packCb.PackComboBox(5, "0", 1, ui.Props{Text: "0|1|2|3|4|5|6|7|8|9|10"})
+	cb.OnChange(func(ev ui.Event) {
+		ts.AddItem(fmt.Sprintf("ComboBox changed to %v", ev.Msg))
+	})
+	packFiller := packLeft.AddPack(ui.PackHorizontal, 1)
+	packFiller.PackFrame(1, 1, "", 1, emptyProp)
+	packBtn := packLeft.AddPack(ui.PackHorizontal, ui.DoNotScale)
+	btnSet := packBtn.PackButton(11, 3, "Set Value", ui.DoNotScale, emptyProp)
+	btnSet.OnClick(func(ev ui.Event) {
+		v := cb.GetText()
+		ts.AddItem(fmt.Sprintf("New ProgressBar value: %v", v))
+		updateProgress(v, pb)
+	})
+	packBtn.PackFrame(2, 1, "", 1, emptyProp)
+	btnStep := packBtn.PackButton(6, 3, "Step", ui.DoNotScale, emptyProp)
+	btnStep.OnClick(func(ev ui.Event) {
+		go pb.Step()
+		ts.AddItem("ProgressBar step")
+	})
+	packBtn.PackFrame(2, 1, "", 1, emptyProp)
+	btnQuit := packBtn.PackButton(6, 3, "Quit", ui.DoNotScale, emptyProp)
+	btnQuit.OnClick(func(ev ui.Event) {
+		go c.Stop()
+	})
+	packBtn.PackFrame(1, 1, "", ui.DoNotScale, emptyProp)
+
+	// Method must be called after all Window controls are added to it
+	// Otherwise window won't display anything
+	wnd.PackEnd()
+}
+
+func createManualView(c *ui.Composer) {
+	emptyProp := ui.Props{}
+
+	w, h := 64, 14
+	wnd := c.CreateWindow(1, 0, w, h, "Manual Layout", emptyProp)
+	wnd.SetConstraints(w, h)
+	ui.CreateFrame(wnd, 0, 0, 30, h-2, "Task Progress", ui.Props{Border: ui.BorderSingle, Anchors: ui.AnchorAll})
+	ui.CreateFrame(wnd, 30, 0, w-2-30, h-2, "Event List", ui.Props{Border: ui.BorderSingle, Anchors: ui.AnchorRight | ui.AnchorHeight})
+
+	ts := ui.CreateTextScroll(wnd, 31, 1, w-2-30-2, h-4, ui.Props{Anchors: ui.AnchorRight | ui.AnchorHeight})
+
+	pb := ui.CreateProgressBar(wnd, 1, 2, 30-2, 1, 0, 10, ui.Props{Anchors: ui.AnchorWidth})
+	ui.CreateLabel(wnd, 1, 4, 22, "Set ProgressBar Value", emptyProp)
+	cb := ui.CreateComboBox(wnd, 1+22, 4, 6, "0", ui.Props{Anchors: ui.AnchorWidth})
+	var _ = pb
+	cb.OnChange(func(ev ui.Event) {
+		ts.AddItem(fmt.Sprintf("ComboBox changed to %v", ev.Msg))
+	})
+
+	btnSet := ui.CreateButton(wnd, 1, 6, 11, 3, "Set Value", ui.Props{Anchors: ui.AnchorBottom})
+	btnSet.OnClick(func(ev ui.Event) {
+		v := cb.GetText()
+		ts.AddItem(fmt.Sprintf("New ProgressBar value: %v", v))
+		updateProgress(v, pb)
+	})
+
+	btnStep := ui.CreateButton(wnd, 1+11+2, 6, 6, 3, "Step", ui.Props{Anchors: ui.AnchorBottom})
+	btnStep.OnClick(func(ev ui.Event) {
+		go pb.Step()
+		ts.AddItem("ProgressBar step")
+	})
+	btnQuit := ui.CreateButton(wnd, 1+11+2+6+2, 6, 6, 3, "Quit", ui.Props{Anchors: ui.AnchorBottom | ui.AnchorRight})
+	btnQuit.OnClick(func(ev ui.Event) {
+		go c.Stop()
+	})
+}
+
+func mainLoop() {
+	// Every application must create a single Composer and
+	// call its intialize method
+	var c ui.Composer
+	c.Init()
+	defer c.Close()
+
+	createManualView(&c)
+	createDynamicView(&c)
+
+	c.RefreshScreen()
+	// start event precessing loop - the main core of the library
+	c.MainLoop()
+}
+
+func main() {
+	mainLoop()
+}