#84 - add new Control property Visible

barchart.go

@@ -106,6 +106,10 @@ func CreateBarChart(parent Control, w, h int, scale int) *BarChart {
 
 // Repaint draws the control on its View surface
 func (b *BarChart) Draw() {
+	if b.hidden {
+		return
+	}
+
 	b.mtx.RLock()
 	defer b.mtx.RUnlock()
 

base_control.go

@@ -19,6 +19,7 @@ type BaseControl struct {
 	bgActive      term.Attribute
 	tabSkip       bool
 	disabled      bool
+	hidden        bool
 	align         Align
 	parent        Control
 	inactive      bool
@@ -118,6 +119,34 @@ func (c *BaseControl) SetEnabled(enabled bool) {
 	c.disabled = !enabled
 }
 
+func (c *BaseControl) Visible() bool {
+	c.mtx.RLock()
+	defer c.mtx.RUnlock()
+
+	return !c.hidden
+}
+
+func (c *BaseControl) SetVisible(visible bool) {
+	c.mtx.Lock()
+	defer c.mtx.Unlock()
+
+	if visible == !c.hidden {
+		return
+	}
+
+	c.hidden = !visible
+	if c.parent == nil {
+		return
+	}
+
+	p := c.Parent()
+	for p.Parent() != nil {
+		p = p.Parent()
+	}
+
+    go PutEvent(Event{Type: EventLayout, Target: p})
+}
+
 func (c *BaseControl) Parent() Control {
 	return c.parent
 }
@@ -204,23 +233,39 @@ func (c *BaseControl) SetBackColor(clr term.Attribute) {
 	c.bg = clr
 }
 
+func (c *BaseControl) childCount() int {
+	cnt := 0
+	for _, child := range c.children {
+		if child.Visible() {
+			cnt++
+		}
+	}
+
+	return cnt
+}
+
 func (c *BaseControl) ResizeChildren() {
-	if len(c.children) == 0 {
+	children := c.childCount()
+	if children == 0 {
 		return
 	}
 
 	fullWidth := c.width - 2*c.padX
 	fullHeight := c.height - 2*c.padY
 	if c.pack == Horizontal {
-		fullWidth -= (len(c.children) - 1) * c.gapX
+		fullWidth -= (children - 1) * c.gapX
 	} else {
-		fullHeight -= (len(c.children) - 1) * c.gapY
+		fullHeight -= (children - 1) * c.gapY
 	}
 
 	totalSc := c.ChildrenScale()
 	minWidth := 0
 	minHeight := 0
 	for _, child := range c.children {
+		if !child.Visible() {
+			continue
+		}
+
 		cw, ch := child.MinimalSize()
 		if c.pack == Horizontal {
 			minWidth += cw
@@ -239,6 +284,10 @@ func (c *BaseControl) ResizeChildren() {
 	}
 
 	for _, ctrl := range c.children {
+		if !ctrl.Visible() {
+			continue
+		}
+
 		tw, th := ctrl.MinimalSize()
 		sc := ctrl.Scale()
 		d := int(ctrl.Scale() * aStep)
@@ -332,20 +381,23 @@ func (c *BaseControl) ChildExists(control Control) bool {
 }
 
 func (c *BaseControl) ChildrenScale() int {
-	if len(c.children) == 0 {
+	if c.childCount() == 0 {
 		return c.scale
 	}
 
 	total := 0
 	for _, ctrl := range c.children {
+		if ctrl.Visible() {
 			total += ctrl.Scale()
 		}
+	}
 
 	return total
 }
 
 func (c *BaseControl) MinimalSize() (w int, h int) {
-	if len(c.children) == 0 {
+	children := c.childCount()
+	if children == 0 {
 		return c.minW, c.minH
 	}
 
@@ -353,12 +405,15 @@ func (c *BaseControl) MinimalSize() (w int, h int) {
 	totalY := 2 * c.padY
 
 	if c.pack == Vertical {
-		totalY += (len(c.children) - 1) * c.gapY
+		totalY += (children - 1) * c.gapY
 	} else {
-		totalX += (len(c.children) - 1) * c.gapX
+		totalX += (children - 1) * c.gapX
 	}
 
 	for _, ctrl := range c.children {
+		if !ctrl.Visible() {
+			continue
+		}
 		ww, hh := ctrl.MinimalSize()
 		if c.pack == Vertical {
 			totalY += hh
@@ -388,6 +443,10 @@ func (c *BaseControl) Draw() {
 }
 
 func (c *BaseControl) DrawChildren() {
+	if c.hidden {
+		return
+	}
+
 	PushClip()
 	defer PopClip()
 
@@ -422,14 +481,18 @@ func (c *BaseControl) ProcessEvent(ev Event) bool {
 }
 
 func (c *BaseControl) PlaceChildren() {
-	if c.children == nil || len(c.children) == 0 {
+	children := c.childCount()
+	if c.children == nil || children == 0 {
 		return
 	}
 
 	xx, yy := c.x+c.padX, c.y+c.padY
 	for _, ctrl := range c.children {
-		ctrl.SetPos(xx, yy)
+		if !ctrl.Visible() {
+			continue
+		}
 
+		ctrl.SetPos(xx, yy)
 		ww, hh := ctrl.Size()
 		if c.pack == Vertical {
 			yy += c.gapY + hh

button.go

@@ -3,8 +3,8 @@ package clui
 import (
 	xs "github.com/huandu/xstrings"
 	term "github.com/nsf/termbox-go"
-	"time"
 	"sync/atomic"
+	"time"
 )
 
 /*
@@ -63,6 +63,10 @@ func CreateButton(parent Control, width, height int, title string, scale int) *B
 
 // Repaint draws the control on its View surface
 func (b *Button) Draw() {
+	if b.hidden {
+		return
+	}
+
 	b.mtx.RLock()
 	defer b.mtx.RUnlock()
 	PushAttributes()

changelog

@@ -1,4 +1,15 @@
-2018-01-26 - version 0.7.0
+2018-03-13 - version 0.8.0-RC1
+[+] Added new property for all controls: Visible. It makes possible to show
+    and hide any control with its children(if there are any).
+    New Control interface methods: Visible and SetVisible
+[+] A new event to support hiding/displaying controls: EventLayout with one
+    argument - Control that should handle the event. On receiving the event
+    the Control must recalculate and reposition all its children.
+    At this moment only Windows handle this event. Other kinds of Control
+    never receieves the event
+[+] Add a new simple demo to play with Control visiblity: demos/visible
+
+2018-01-26 - version 0.7.0
 [+] Added new event handler for Window: set a callback OnScreenResize if you
     want to handle terminal resize event
 

checkbox.go

@@ -52,6 +52,10 @@ func CreateCheckBox(parent Control, width int, title string, scale int) *CheckBo
 
 // Repaint draws the control on its View surface
 func (c *CheckBox) Draw() {
+	if c.hidden {
+		return
+	}
+
 	c.mtx.RLock()
 	defer c.mtx.RUnlock()
 

composer.go

@@ -696,5 +696,13 @@ func ProcessEvent(ev Event) {
 		comp.processKey(ev)
 	case EventMouse:
 		comp.processMouse(ev)
+	case EventLayout:
+		for _, c := range comp.windows {
+			if c == ev.Target {
+				c.ResizeChildren()
+				c.PlaceChildren()
+				break
+			}
+		}
 	}
 }

consts.go

@@ -85,6 +85,7 @@ type Event struct {
 	// For resize event - new terminal size
 	Width  int
 	Height int
+	Target Control
 }
 
 // BorderStyle constants
@@ -288,6 +289,8 @@ const (
 	EventQuit
 	// Close top window - or application is there is only one window
 	EventCloseWindow
+	// Make a control (Target field of Event structure) to recalculate and reposition all its children
+	EventLayout
 )
 
 // ConfirmationDialog and SelectDialog exit codes

control_intf.go

@@ -38,6 +38,9 @@ type Control interface {
 	// Enable return if a control can process keyboard and mouse events
 	Enabled() bool
 	SetEnabled(enabled bool)
+	// Visible return if a control is visible
+	Visible() bool
+	SetVisible(enabled bool)
 	// Parent return control's container or nil if there is no parent container
 	// that is true for Windows
 	Parent() Control

ctrlutil.go

@@ -211,7 +211,7 @@ func _nextControl(parent Control, curr, prev Control, foundPrev, next bool) (boo
 			}
 		}
 
-		if ctrl.Enabled() && ctrl.TabStop() {
+		if ctrl.Enabled() && ctrl.TabStop() && ctrl.Visible() {
 			if found {
 				return found, ctrl
 			} else if !next {
@@ -233,7 +233,7 @@ func _nextControl(parent Control, curr, prev Control, foundPrev, next bool) (boo
 // that has tab-stop feature on. Used by library when processing TAB key
 func NextControl(parent Control, curr Control, next bool) Control {
 	fnTab := func(c Control) bool {
-		return c.TabStop()
+		return c.TabStop() && c.Visible()
 	}
 
 	var defControl Control

demos/visible/visible.go

@@ -0,0 +1,62 @@
+package main
+
+import (
+	ui "github.com/VladimirMarkelov/clui"
+)
+
+func main() {
+	ui.InitLibrary()
+	defer ui.DeinitLibrary()
+
+	view := ui.AddWindow(0, 0, 10, 7, "Hello World!")
+	view.SetPack(ui.Vertical)
+
+	frmResize := ui.CreateFrame(view, 8, 6, ui.BorderNone, ui.Fixed)
+	frmResize.SetTitle("FrameTop")
+	frmResize.SetPack(ui.Horizontal)
+	btn1 := ui.CreateButton(frmResize, 8, 5, "Button 1", 1)
+	btn2 := ui.CreateButton(frmResize, 8, 5, "Button 2", 1)
+	btn3 := ui.CreateButton(frmResize, 8, 5, "Button 3", 1)
+
+	frmBtns := ui.CreateFrame(view, 8, 5, ui.BorderNone, ui.Fixed)
+	frmBtns.SetPack(ui.Horizontal)
+	frmBtns.SetTitle("FrameBottom")
+
+	btnHide1 := ui.CreateButton(frmBtns, 8, 4, "Hide 1", 1)
+	btnHide1.OnClick(func(ev ui.Event) {
+		if btn1.Visible() {
+			btnHide1.SetTitle("Show 1")
+			btn1.SetVisible(false)
+		} else {
+			btnHide1.SetTitle("Hide 1")
+			btn1.SetVisible(true)
+		}
+	})
+	btnHide2 := ui.CreateButton(frmBtns, 8, 4, "Hide 2", 1)
+	btnHide2.OnClick(func(ev ui.Event) {
+		if btn2.Visible() {
+			btnHide2.SetTitle("Show 2")
+			btn2.SetVisible(false)
+		} else {
+			btnHide2.SetTitle("Hide 2")
+			btn2.SetVisible(true)
+		}
+	})
+	btnHide3 := ui.CreateButton(frmBtns, 8, 4, "Hide 3", 1)
+	btnHide3.OnClick(func(ev ui.Event) {
+		if btn3.Visible() {
+			btnHide3.SetTitle("Show 3")
+			btn3.SetVisible(false)
+		} else {
+			btnHide3.SetTitle("Hide 3")
+			btn3.SetVisible(true)
+		}
+	})
+
+	btnQuit := ui.CreateButton(frmBtns, 8, 4, "Quit", 1)
+	btnQuit.OnClick(func(ev ui.Event) {
+		go ui.Stop()
+	})
+
+	ui.MainLoop()
+}

edit.go

@@ -32,6 +32,10 @@ func (e *EditField) SetTitle(title string) {
 
 // Repaint draws the control on its View surface
 func (e *EditField) Draw() {
+	if e.hidden {
+		return
+	}
+
 	PushAttributes()
 	defer PopAttributes()
 

frame.go

@@ -59,6 +59,10 @@ func CreateFrame(parent Control, width, height int, bs BorderStyle, scale int) *
 
 // Repaint draws the control on its View surface
 func (f *Frame) Draw() {
+	if f.hidden {
+		return
+	}
+
 	PushAttributes()
 	defer PopAttributes()
 

label.go

@@ -63,6 +63,10 @@ func (l *Label) SetDirection(dir Direction) {
 }
 
 func (l *Label) Draw() {
+	if l.hidden {
+		return
+	}
+
 	PushAttributes()
 	defer PopAttributes()
 

listbox.go

@@ -111,6 +111,10 @@ func (l *ListBox) drawItems() {
 
 // Repaint draws the control on its View surface
 func (l *ListBox) Draw() {
+	if l.hidden {
+		return
+	}
+
 	PushAttributes()
 	defer PopAttributes()
 

progressbar.go

@@ -71,6 +71,10 @@ func CreateProgressBar(parent Control, width, height int, scale int) *ProgressBa
 //      pb.SetTitle("{{value}} of {{max}}")
 //      pb.SetTitle("{{percent}}%")
 func (b *ProgressBar) Draw() {
+	if b.hidden {
+		return
+	}
+
 	b.mtx.RLock()
 	defer b.mtx.RUnlock()
 	if b.max <= b.min {

radio.go

@@ -48,6 +48,10 @@ func CreateRadio(parent Control, width int, title string, scale int) *Radio {
 
 // Repaint draws the control on its View surface
 func (c *Radio) Draw() {
+	if c.hidden {
+		return
+	}
+
 	PushAttributes()
 	defer PopAttributes()
 

sparkchart.go

@@ -72,6 +72,10 @@ func CreateSparkChart(parent Control, w, h int, scale int) *SparkChart {
 
 // Repaint draws the control on its View surface
 func (b *SparkChart) Draw() {
+	if b.hidden {
+		return
+	}
+
 	b.mtx.RLock()
 	defer b.mtx.RUnlock()
 

tableview.go

@@ -348,6 +348,10 @@ func (l *TableView) drawCells() {
 
 // Repaint draws the control on its View surface
 func (l *TableView) Draw() {
+	if l.hidden {
+		return
+	}
+
 	l.mtx.RLock()
 	defer l.mtx.RUnlock()
 	PushAttributes()

textreader.go

@@ -80,6 +80,10 @@ func (l *TextReader) drawText() {
 
 // Repaint draws the control on its View surface
 func (l *TextReader) Draw() {
+	if l.hidden {
+		return
+	}
+
 	PushAttributes()
 	defer PopAttributes()
 

textview.go

@@ -166,6 +166,10 @@ func (l *TextView) drawText() {
 
 // Repaint draws the control on its View surface
 func (l *TextView) Draw() {
+	if l.hidden {
+		return
+	}
+
 	PushAttributes()
 	defer PopAttributes()