Add Scrolling in the Doodad Palette Window

* Rudimentary scrolling shows a Left and Right button at the top of the
  Doodad Palette if your window is deemed not tall enough to contain all
  of the doodads.
* A "progress bar" is shown between the buttons indicating the
  percentage of your scroll down the doodad list. When you're able to
  see the final row of doodads, the progress bar is at 100%.

pkg/doodads/fmt_readwrite.go

@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"io/ioutil"
 	"runtime"
+	"sort"
 	"strings"
 
 	"git.kirsle.net/apps/doodle/pkg/bindata"
@@ -57,6 +58,8 @@ func ListDoodads() ([]string, error) {
 		}
 	}
 
+	sort.Strings(result)
+
 	return result, err
 }
 

pkg/editor_scene.go

@@ -174,12 +174,15 @@ func (s *EditorScene) Loop(d *Doodle, ev *events.State) error {
 	case "l":
 		d.Flash("Line Tool selected.")
 		s.UI.Canvas.Tool = drawtool.LineTool
+		s.UI.activeTool = s.UI.Canvas.Tool.String()
 	case "f":
 		d.Flash("Pencil Tool selected.")
 		s.UI.Canvas.Tool = drawtool.PencilTool
+		s.UI.activeTool = s.UI.Canvas.Tool.String()
 	case "r":
 		d.Flash("Rectangle Tool selected.")
 		s.UI.Canvas.Tool = drawtool.RectTool
+		s.UI.activeTool = s.UI.Canvas.Tool.String()
 	}
 
 	return nil

pkg/editor_ui.go

@@ -49,8 +49,15 @@ type EditorUI struct {
 	PaletteTab *ui.Frame
 	DoodadTab  *ui.Frame
 
+	// Doodad Palette window variables.
+	doodadSkip       int
+	doodadRows       []*ui.Frame
+	doodadPager      *ui.Frame
+	doodadButtonSize int32
+	doodadScroller   *ui.Frame
+
 	// ToolBar window.
-	activeTool *string
+	activeTool string
 
 	// Draggable Doodad canvas.
 	DraggableActor *DraggableActor
@@ -72,8 +79,7 @@ func NewEditorUI(d *Doodle, s *EditorScene) *EditorUI {
 	}
 
 	// Default tool in the toolbox.
-	activeTool := drawtool.PencilTool.String()
-	u.activeTool = &activeTool
+	u.activeTool = drawtool.PencilTool.String()
 
 	// Bind the StatusBoxes arrays to the text variables.
 	u.StatusBoxes = []*string{
@@ -154,6 +160,8 @@ func (u *EditorUI) Resized(d *Doodle) {
 			u.MenuBar.BoxSize().H,
 		))
 		u.Palette.Compute(d.Engine)
+
+		u.scrollDoodadFrame(0)
 	}
 
 	var innerHeight = int32(u.d.height) - u.MenuBar.Size().H - u.StatusBar.Size().H

pkg/editor_ui_doodad.go

@@ -49,8 +49,6 @@ func (u *EditorUI) setupDoodadFrame(e render.Engine, window *ui.Window) (*ui.Fra
 		perRow = balance.UIDoodadsPerRow
 	)
 
-	frame.SetBackground(render.RGBA(0, 153, 255, 153))
-
 	// Pager buttons on top of the doodad list.
 	pager := ui.NewFrame("Doodad Pager")
 	pager.SetBackground(render.RGBA(255, 0, 0, 20)) // TODO: if I don't set a background color,
@@ -59,28 +57,40 @@ func (u *EditorUI) setupDoodadFrame(e render.Engine, window *ui.Window) (*ui.Fra
 	{
 		leftBtn := ui.NewButton("Prev Page", ui.NewLabel(ui.Label{
 			Text: "<",
+			Font: balance.MenuFont,
 		}))
+		leftBtn.Handle(ui.Click, func(p render.Point) {
+			u.scrollDoodadFrame(-1)
+		})
 		u.Supervisor.Add(leftBtn)
 		pager.Pack(leftBtn, ui.Pack{
 			Anchor: ui.W,
 		})
 
-		pageLabel := ui.NewLabel(ui.Label{
-			Text: "    Page 1 of 20",
+		scroller := ui.NewFrame("Doodad Scroll Progressbar")
+		scroller.Configure(ui.Config{
+			Width:      20,
+			Height:     20,
+			Background: render.RGBA(128, 128, 128, 128),
 		})
-		pager.Pack(pageLabel, ui.Pack{
+		pager.Pack(scroller, ui.Pack{
 			Anchor: ui.W,
-			Expand: true,
 		})
+		u.doodadScroller = scroller
 
 		rightBtn := ui.NewButton("Next Page", ui.NewLabel(ui.Label{
 			Text: ">",
+			Font: balance.MenuFont,
 		}))
+		rightBtn.Handle(ui.Click, func(p render.Point) {
+			u.scrollDoodadFrame(1)
+		})
 		u.Supervisor.Add(rightBtn)
 		pager.Pack(rightBtn, ui.Pack{
-			Anchor: ui.W,
+			Anchor: ui.E,
 		})
 	}
+	u.doodadPager = pager
 	frame.Pack(pager, ui.Pack{
 		Anchor: ui.N,
 		Fill:   true,
@@ -96,24 +106,28 @@ func (u *EditorUI) setupDoodadFrame(e render.Engine, window *ui.Window) (*ui.Fra
 	}
 
 	var buttonSize = (paletteWidth - window.BoxThickness(2)) / int32(perRow)
+	u.doodadButtonSize = buttonSize
 
 	// Draw the doodad buttons in a grid `perRow` buttons wide.
 	var (
 		row      *ui.Frame
 		rowCount int             // for labeling the ui.Frame for each row
+		btnRows  = []*ui.Frame{} // Collect the row frames for the buttons.
 	)
 	for i, filename := range doodadsAvailable {
+		filename := filename
+
 		if row == nil || i%perRow == 0 {
 			rowCount++
 			row = ui.NewFrame(fmt.Sprintf("Doodad Row %d", rowCount))
 			row.SetBackground(balance.WindowBackground)
+			btnRows = append(btnRows, row)
 			frame.Pack(row, ui.Pack{
 				Anchor: ui.N,
 				Fill:   true,
 			})
 		}
 
-		func(filename string) {
 		doodad, err := doodads.LoadFile(filename)
 		if err != nil {
 			log.Error(err.Error())
@@ -152,8 +166,78 @@ func (u *EditorUI) setupDoodadFrame(e render.Engine, window *ui.Window) (*ui.Fra
 		)
 
 		btn.Compute(e)
-		}(filename)
 	}
 
+	u.doodadRows = btnRows
+	u.scrollDoodadFrame(0)
+
 	return frame, nil
 }
+
+// scrollDoodadFrame handles the Page Up/Down buttons to adjust the number of
+// Doodads visible on screen.
+//
+// rows is the number of rows to scroll. Positive values mean scroll *down*
+// the list.
+func (u *EditorUI) scrollDoodadFrame(rows int) {
+	u.doodadSkip += rows
+	if u.doodadSkip < 0 {
+		u.doodadSkip = 0
+	}
+
+	log.Info("scrollDoodadFrame(%d): skip=%d", rows, u.doodadSkip)
+
+	// Calculate about how many rows we can see given our current window size.
+	var (
+		maxVisibleHeight = int32(u.d.height - 86)
+		calculatedHeight int32
+		rowsBefore       int // count of rows hidden before
+		rowsVisible      int
+		rowsAfter        int                                     // count of rows hidden after
+		rowsEstimated    = maxVisibleHeight / u.doodadButtonSize // estimated number rows shown
+		maxSkip          = ((len(u.doodadRows) * int(u.doodadButtonSize)) - int(u.doodadButtonSize*rowsEstimated)) / int(u.doodadButtonSize)
+	)
+
+	if maxSkip < 0 {
+		maxSkip = 0
+	}
+
+	log.Info("maxSkip = (%d * %d) - (%d * %d) = %d", len(u.doodadRows), u.doodadButtonSize, u.doodadButtonSize, rowsEstimated, maxSkip)
+	// log.Info("maxSkip: estimate=%d rows=%d - visible=%d => %d", rowsEstimated, len(u.doodadRows), rowsVisible, maxSkip)
+	if u.doodadSkip > maxSkip {
+		u.doodadSkip = maxSkip
+	}
+
+	// If the window is big enough to encompass all the doodads, don't show
+	// the pager toolbar, its just confusing.
+	if maxSkip == 0 {
+		u.doodadPager.Hide()
+	} else {
+		u.doodadPager.Show()
+	}
+
+	// Comb through the doodads and show/hide the relevant buttons.
+	for i, row := range u.doodadRows {
+		if i < u.doodadSkip {
+			row.Hide()
+			rowsBefore++
+			continue
+		}
+
+		calculatedHeight += u.doodadButtonSize
+		if calculatedHeight > maxVisibleHeight {
+			row.Hide()
+			rowsAfter++
+		} else {
+			row.Show()
+			rowsVisible++
+		}
+	}
+
+	var viewPercent = float64(rowsBefore+rowsVisible) / float64(len(u.doodadRows))
+	u.doodadScroller.Configure(ui.Config{
+		Width: int32(float64(paletteWidth-50) * viewPercent), // TODO: hacky magic number
+	})
+	log.Info("v%% = (%d + %d) / %d = %f", rowsBefore, rowsVisible, len(u.doodadRows), viewPercent)
+
+}

pkg/editor_ui_toolbar.go

@@ -97,7 +97,7 @@ func (u *EditorUI) SetupToolbar(d *Doodle) *ui.Frame {
 
 		btn := ui.NewRadioButton(
 			button.Value,
-			u.activeTool,
+			&u.activeTool,
 			button.Value,
 			image,
 		)