Example of TableView (#217)

- Shows how to create a TableView
- Dynamically updates data in the table

Author: corruptmemory

macos/_examples/tableview/main.go

@@ -0,0 +1,254 @@
+package main
+
+import (
+	"context"
+	"fmt"
+	"github.com/progrium/macdriver/dispatch"
+	"github.com/progrium/macdriver/macos/appkit"
+	"github.com/progrium/macdriver/macos/foundation"
+	"github.com/progrium/macdriver/objc"
+	"runtime"
+	"sync"
+	"time"
+)
+
+const (
+	RowHeight = 20
+)
+
+type App struct {
+	app          appkit.Application
+	windowClosed bool
+	doStop       func()
+}
+
+func (a *App) Stop() {
+	a.doStop()
+}
+
+func newApp(app appkit.Application) *App {
+	return &App{
+		app: app,
+	}
+}
+
+func main() {
+	runtime.LockOSThread()
+
+	app := appkit.Application_SharedApplication()
+	tvApp := newApp(app)
+	delegate := &appkit.ApplicationDelegate{}
+	delegate.SetApplicationDidFinishLaunching(func(foundation.Notification) {
+		tvApp.mainWindow()
+	})
+	delegate.SetApplicationWillFinishLaunching(func(foundation.Notification) {
+		tvApp.setMainMenu()
+	})
+	delegate.SetApplicationShouldTerminateAfterLastWindowClosed(func(appkit.Application) bool {
+		return true
+	})
+	delegate.SetApplicationWillTerminate(func(foundation.Notification) {
+		tvApp.Stop()
+	})
+
+	app.SetDelegate(delegate)
+	app.Run()
+}
+
+type TableViewDataSource struct {
+	values        chan [][2]objc.Object
+	data          [][2]objc.Object
+	delegate      *TableViewDataSourceDelegate
+	wg            *sync.WaitGroup
+	maxRows       int
+	overflowValue int
+}
+
+func (t *TableViewDataSource) Wait() {
+	t.wg.Wait()
+}
+
+func (t *TableViewDataSource) Start(ctx context.Context, tableView appkit.TableView) {
+	t.wg.Add(1)
+	go valueGenerator(ctx, t.wg, t.values, tableView, t.maxRows, t.overflowValue)
+}
+
+func valueGenerator(ctx context.Context, wg *sync.WaitGroup, values chan<- [][2]objc.Object, tableView appkit.TableView, maxRows int, overflowValue int) {
+	defer wg.Done()
+	currentValues := make([][2]int, maxRows)
+	sendToUI := func() {
+		snapshot := make([][2]objc.Object, len(currentValues))
+		for i, v := range currentValues {
+			snapshot[i] = [2]objc.Object{foundation.String_StringWithString(fmt.Sprintf("%d", v[0])).Object, foundation.String_StringWithString(fmt.Sprintf("%d", v[1])).Object}
+		}
+		select {
+		case <-ctx.Done():
+			return
+		case values <- snapshot:
+			dispatch.MainQueue().DispatchAsync(func() {
+				tableView.SetNeedsDisplay(true)
+			})
+		}
+	}
+	counter := 0
+	row := 0
+	for {
+		row = counter / 2
+		if row >= maxRows {
+			row = 0
+			break
+		}
+		currentValues[row][counter%2] = counter % overflowValue
+		counter++
+	}
+	sendToUI()
+
+	for {
+		select {
+		case <-ctx.Done():
+			return
+		default:
+			time.Sleep(10 * time.Millisecond)
+			row = (counter / 2) % maxRows
+			currentValues[row][counter%2] = counter % overflowValue
+			counter++
+			sendToUI()
+		}
+	}
+
+}
+
+func (t *TableViewDataSource) getLatest(ctx context.Context) {
+	switch t.data {
+	case nil:
+		select {
+		case t.data = <-t.values:
+		case <-ctx.Done():
+			t.data = nil
+			return
+		}
+	default:
+		select {
+		case t.data = <-t.values:
+		case <-ctx.Done():
+			t.data = nil
+			return
+		default:
+		}
+	}
+}
+
+func NewTableViewDataSource(ctx context.Context, maxRows int, overflowValue int) *TableViewDataSource {
+	model := &TableViewDataSource{
+		maxRows:       maxRows,
+		overflowValue: overflowValue,
+		values:        make(chan [][2]objc.Object, 1),
+		data:          nil,
+		delegate:      &TableViewDataSourceDelegate{},
+		wg:            &sync.WaitGroup{},
+	}
+	model.delegate.SetTableViewObjectValueForTableColumnRow(func(tableView appkit.TableView, tableColumn appkit.TableColumn, row int) objc.Object {
+		model.getLatest(ctx)
+		if model.data == nil {
+			return objc.ObjectFrom(nil)
+		}
+		switch tableColumn.Identifier() {
+		case "Column1":
+			return model.data[row][0]
+		case "Column2":
+			return model.data[row][1]
+		}
+		panic("unknown column")
+	})
+	model.delegate.SetNumberOfRowsInTableView(func(tableView appkit.TableView) int {
+		model.getLatest(ctx)
+		return len(model.data)
+	})
+	return model
+}
+
+func (a *App) mainWindow() {
+	w := appkit.NewWindowWithSize(300, 400)
+	objc.Retain(&w)
+	a.windowClosed = false
+
+	wd := &appkit.WindowDelegate{}
+	wd.SetWindowWillClose(func(notification foundation.Notification) {
+		a.windowClosed = true
+	})
+	w.SetDelegate(wd)
+
+	ctx := context.Background()
+	ctx, cancel := context.WithCancel(ctx)
+	dataSource := NewTableViewDataSource(ctx, 40, 13)
+	a.doStop = func() {
+		cancel()
+		dataSource.Wait()
+		if !a.windowClosed {
+			w.Close()
+		}
+	}
+
+	w.SetTitle("Test table view")
+
+	tableView := appkit.NewTableView()
+	go dataSource.Start(ctx, tableView)
+	tableView.SetRowHeight(RowHeight)
+	tableView.SetTranslatesAutoresizingMaskIntoConstraints(false)
+	tableView.SetHeaderView(appkit.NewTableHeaderViewWithFrame(rectOf(0, 0, 0, RowHeight)))
+	tableView.SetGridStyleMask(appkit.TableViewSolidVerticalGridLineMask | appkit.TableViewSolidHorizontalGridLineMask)
+	tableView.SetStyle(appkit.TableViewStylePlain)
+	tableView.SetRowSizeStyle(appkit.TableViewRowSizeStyleDefault)
+	tableView.SetColumnAutoresizingStyle(appkit.TableViewUniformColumnAutoresizingStyle)
+	tableView.SetUsesAlternatingRowBackgroundColors(true)
+	tableView.SetStyle(appkit.TableViewStyleFullWidth)
+	tableView.SetTranslatesAutoresizingMaskIntoConstraints(false)
+	tableColumn1 := appkit.NewTableColumn().InitWithIdentifier("Column1")
+	tableColumn1.SetTitle("Test 1")
+	tableColumn1.SetWidth(100)
+	tableView.AddTableColumn(tableColumn1)
+	tableColumn2 := appkit.NewTableColumn().InitWithIdentifier("Column2")
+	tableColumn2.SetTitle("Test 2")
+	tableColumn2.SetWidth(100)
+	tableView.AddTableColumn(tableColumn2)
+	tableView.SetDataSource(dataSource.delegate)
+	tableView.SetAllowsColumnSelection(true)
+	tableView.SetAutoresizingMask(appkit.ViewWidthSizable | appkit.ViewHeightSizable)
+
+	tsv := appkit.NewScrollView()
+	tsv.SetFrameSize(foundation.Size{Width: w.ContentView().Frame().Size.Width, Height: w.ContentView().Frame().Size.Height})
+	tsv.SetFrameOrigin(foundation.Point{X: w.ContentView().Frame().Origin.X, Y: w.ContentView().Frame().Origin.Y})
+	tsv.SetTranslatesAutoresizingMaskIntoConstraints(false)
+	tsv.SetDocumentView(tableView)
+	tsv.SetHasHorizontalScroller(true)
+	tsv.SetHasVerticalScroller(true)
+	tsv.SetAutohidesScrollers(true)
+	tsv.SetTranslatesAutoresizingMaskIntoConstraints(true)
+	tsv.SetAutoresizingMask(appkit.ViewWidthSizable | appkit.ViewHeightSizable)
+	w.ContentView().AddSubview(tsv)
+	w.ContentView().LeadingAnchor().ConstraintEqualToAnchorConstant(tsv.LeadingAnchor(), -10).SetActive(true)
+	w.ContentView().TopAnchor().ConstraintEqualToAnchorConstant(tsv.TopAnchor(), -10).SetActive(true)
+	w.ContentView().TrailingAnchor().ConstraintEqualToAnchorConstant(tsv.TrailingAnchor(), 10).SetActive(true)
+	w.ContentView().BottomAnchor().ConstraintEqualToAnchorConstant(tsv.BottomAnchor(), 10).SetActive(true)
+
+	w.Center()
+	w.MakeKeyAndOrderFront(nil)
+
+	a.app.SetActivationPolicy(appkit.ApplicationActivationPolicyRegular)
+	a.app.ActivateIgnoringOtherApps(true)
+}
+
+func (a *App) setMainMenu() {
+	menuBar := appkit.NewMenuWithTitle("Table View")
+	a.app.SetMainMenu(menuBar)
+
+	appMenuItem := appkit.NewMenuItemWithSelector("Table View", "", objc.Selector{})
+	appMenu := appkit.NewMenuWithTitle("Table View")
+	appMenu.AddItem(appkit.NewMenuItemWithAction("Quit", "q", func(sender objc.Object) { a.app.Terminate(nil) }))
+	appMenuItem.SetSubmenu(appMenu)
+	menuBar.AddItem(appMenuItem)
+}
+
+func rectOf(x, y, width, height float64) foundation.Rect {
+	return foundation.Rect{Origin: foundation.Point{X: x, Y: y}, Size: foundation.Size{Width: width, Height: height}}
+}