401 lines
10 KiB
Go
401 lines
10 KiB
Go
package mobile
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import (
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"context"
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"image"
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"math"
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"time"
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"fyne.io/fyne/v2"
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"fyne.io/fyne/v2/container"
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"fyne.io/fyne/v2/driver/mobile"
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"fyne.io/fyne/v2/internal/app"
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"fyne.io/fyne/v2/internal/driver"
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"fyne.io/fyne/v2/internal/driver/common"
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"fyne.io/fyne/v2/theme"
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"fyne.io/fyne/v2/widget"
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)
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const (
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doubleClickDelay = 500 // ms (maximum interval between clicks for double click detection)
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)
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var _ fyne.Canvas = (*mobileCanvas)(nil)
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type mobileCanvas struct {
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common.Canvas
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content fyne.CanvasObject
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windowHead, menu fyne.CanvasObject
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scale float32
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size fyne.Size
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touched map[int]mobile.Touchable
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padded, debug bool
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onTypedRune func(rune)
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onTypedKey func(event *fyne.KeyEvent)
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inited bool
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lastTapDown map[int]time.Time
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lastTapDownPos map[int]fyne.Position
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dragging fyne.Draggable
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dragStart, dragOffset fyne.Position
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touchTapCount int
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touchCancelFunc context.CancelFunc
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touchLastTapped fyne.CanvasObject
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}
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// NewCanvas creates a new gomobile mobileCanvas. This is a mobileCanvas that will render on a mobile device using OpenGL.
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func NewCanvas() fyne.Canvas {
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ret := &mobileCanvas{padded: true}
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ret.debug = fyne.CurrentApp().Settings().BuildType() == fyne.BuildDebug
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ret.scale = fyne.CurrentDevice().SystemScaleForWindow(nil) // we don't need a window parameter on mobile
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ret.touched = make(map[int]mobile.Touchable)
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ret.lastTapDownPos = make(map[int]fyne.Position)
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ret.lastTapDown = make(map[int]time.Time)
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ret.Initialize(ret, ret.overlayChanged)
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ret.OnFocus = ret.handleKeyboard
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ret.OnUnfocus = hideVirtualKeyboard
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return ret
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}
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func (c *mobileCanvas) Capture() image.Image {
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return c.Painter().Capture(c)
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}
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func (c *mobileCanvas) Content() fyne.CanvasObject {
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return c.content
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}
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func (c *mobileCanvas) InteractiveArea() (fyne.Position, fyne.Size) {
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scale := fyne.CurrentDevice().SystemScaleForWindow(nil) // we don't need a window parameter on mobile
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dev, ok := fyne.CurrentDevice().(*device)
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if !ok || dev.safeWidth == 0 || dev.safeHeight == 0 {
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return fyne.NewPos(0, 0), c.Size() // running in test mode
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}
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return fyne.NewPos(float32(dev.safeLeft)/scale, float32(dev.safeTop)/scale),
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fyne.NewSize(float32(dev.safeWidth)/scale, float32(dev.safeHeight)/scale)
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}
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func (c *mobileCanvas) OnTypedKey() func(*fyne.KeyEvent) {
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return c.onTypedKey
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}
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func (c *mobileCanvas) OnTypedRune() func(rune) {
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return c.onTypedRune
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}
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func (c *mobileCanvas) PixelCoordinateForPosition(pos fyne.Position) (int, int) {
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return int(float32(pos.X) * c.scale), int(float32(pos.Y) * c.scale)
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}
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func (c *mobileCanvas) Scale() float32 {
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return c.scale
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}
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func (c *mobileCanvas) SetContent(content fyne.CanvasObject) {
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c.setContent(content)
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c.sizeContent(c.Size()) // fixed window size for mobile, cannot stretch to new content
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c.SetDirty()
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}
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func (c *mobileCanvas) SetOnTypedKey(typed func(*fyne.KeyEvent)) {
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c.onTypedKey = typed
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}
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func (c *mobileCanvas) SetOnTypedRune(typed func(rune)) {
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c.onTypedRune = typed
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}
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func (c *mobileCanvas) Size() fyne.Size {
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return c.size
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}
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func (c *mobileCanvas) MinSize() fyne.Size {
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return c.size // TODO check
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}
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func (c *mobileCanvas) findObjectAtPositionMatching(pos fyne.Position, test func(object fyne.CanvasObject) bool) (fyne.CanvasObject, fyne.Position, int) {
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if c.menu != nil {
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return driver.FindObjectAtPositionMatching(pos, test, c.Overlays().Top(), c.menu)
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}
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return driver.FindObjectAtPositionMatching(pos, test, c.Overlays().Top(), c.windowHead, c.content)
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}
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func (c *mobileCanvas) handleKeyboard(obj fyne.Focusable) {
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isDisabled := false
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if disWid, ok := obj.(fyne.Disableable); ok {
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isDisabled = disWid.Disabled()
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}
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if obj != nil && !isDisabled {
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if keyb, ok := obj.(mobile.Keyboardable); ok {
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showVirtualKeyboard(keyb.Keyboard())
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} else {
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showVirtualKeyboard(mobile.DefaultKeyboard)
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}
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} else {
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hideVirtualKeyboard()
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}
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}
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func (c *mobileCanvas) overlayChanged() {
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c.handleKeyboard(c.Focused())
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c.SetDirty()
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}
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func (c *mobileCanvas) Resize(size fyne.Size) {
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if size == c.size {
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return
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}
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c.sizeContent(size)
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}
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func (c *mobileCanvas) setContent(content fyne.CanvasObject) {
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c.content = content
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c.SetContentTreeAndFocusMgr(content)
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}
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func (c *mobileCanvas) setMenu(menu fyne.CanvasObject) {
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c.menu = menu
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c.SetMenuTreeAndFocusMgr(menu)
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}
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func (c *mobileCanvas) setWindowHead(head fyne.CanvasObject) {
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if c.padded {
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head = container.NewPadded(head)
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}
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c.windowHead = head
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c.SetMobileWindowHeadTree(head)
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}
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func (c *mobileCanvas) applyThemeOutOfTreeObjects() {
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if c.menu != nil {
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app.ApplyThemeTo(c.menu, c) // Ensure our menu gets the theme change message as it's out-of-tree
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}
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if c.windowHead != nil {
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app.ApplyThemeTo(c.windowHead, c) // Ensure our child windows get the theme change message as it's out-of-tree
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}
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}
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func (c *mobileCanvas) sizeContent(size fyne.Size) {
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if c.content == nil { // window may not be configured yet
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return
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}
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c.size = size
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offset := fyne.NewPos(0, 0)
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areaPos, areaSize := c.InteractiveArea()
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if c.windowHead != nil {
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topHeight := c.windowHead.MinSize().Height
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chromeBox := c.windowHead.(*fyne.Container)
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if c.padded {
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chromeBox = chromeBox.Objects[0].(*fyne.Container) // the padded container
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}
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if len(chromeBox.Objects) > 1 {
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c.windowHead.Resize(fyne.NewSize(areaSize.Width, topHeight))
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offset = fyne.NewPos(0, topHeight)
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areaSize = areaSize.Subtract(offset)
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} else {
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c.windowHead.Resize(c.windowHead.MinSize())
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}
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c.windowHead.Move(areaPos)
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}
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topLeft := areaPos.Add(offset)
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for _, overlay := range c.Overlays().List() {
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if p, ok := overlay.(*widget.PopUp); ok {
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// TODO: remove this when #707 is being addressed.
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// “Notifies” the PopUp of the canvas size change.
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p.Refresh()
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} else {
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overlay.Resize(areaSize)
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overlay.Move(topLeft)
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}
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}
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if c.padded {
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c.content.Resize(areaSize.Subtract(fyne.NewSize(theme.Padding()*2, theme.Padding()*2)))
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c.content.Move(topLeft.Add(fyne.NewPos(theme.Padding(), theme.Padding())))
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} else {
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c.content.Resize(areaSize)
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c.content.Move(topLeft)
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}
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}
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func (c *mobileCanvas) tapDown(pos fyne.Position, tapID int) {
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c.lastTapDown[tapID] = time.Now()
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c.lastTapDownPos[tapID] = pos
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c.dragging = nil
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co, objPos, layer := c.findObjectAtPositionMatching(pos, func(object fyne.CanvasObject) bool {
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switch object.(type) {
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case mobile.Touchable, fyne.Focusable:
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return true
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}
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return false
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})
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if wid, ok := co.(mobile.Touchable); ok {
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touchEv := &mobile.TouchEvent{}
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touchEv.Position = objPos
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touchEv.AbsolutePosition = pos
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wid.TouchDown(touchEv)
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c.touched[tapID] = wid
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}
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if layer != 1 { // 0 - overlay, 1 - window head / menu, 2 - content
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if wid, ok := co.(fyne.Focusable); !ok || wid != c.Focused() {
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c.Unfocus()
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}
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}
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}
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func (c *mobileCanvas) tapMove(pos fyne.Position, tapID int,
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dragCallback func(fyne.Draggable, *fyne.DragEvent)) {
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previousPos := c.lastTapDownPos[tapID]
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deltaX := pos.X - previousPos.X
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deltaY := pos.Y - previousPos.Y
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if c.dragging == nil && (math.Abs(float64(deltaX)) < tapMoveThreshold && math.Abs(float64(deltaY)) < tapMoveThreshold) {
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return
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}
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c.lastTapDownPos[tapID] = pos
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co, objPos, _ := c.findObjectAtPositionMatching(pos, func(object fyne.CanvasObject) bool {
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if _, ok := object.(fyne.Draggable); ok {
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return true
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} else if _, ok := object.(mobile.Touchable); ok {
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return true
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}
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return false
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})
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if c.touched[tapID] != nil {
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if touch, ok := co.(mobile.Touchable); !ok || c.touched[tapID] != touch {
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touchEv := &mobile.TouchEvent{}
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touchEv.Position = objPos
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touchEv.AbsolutePosition = pos
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c.touched[tapID].TouchCancel(touchEv)
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c.touched[tapID] = nil
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}
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}
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if c.dragging == nil {
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if drag, ok := co.(fyne.Draggable); ok {
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c.dragging = drag
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c.dragOffset = previousPos.Subtract(objPos)
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c.dragStart = co.Position()
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} else {
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return
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}
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}
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ev := &fyne.DragEvent{}
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draggedObjDelta := c.dragStart.Subtract(c.dragging.(fyne.CanvasObject).Position())
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ev.Position = pos.Subtract(c.dragOffset).Add(draggedObjDelta)
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ev.Dragged = fyne.Delta{DX: deltaX, DY: deltaY}
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dragCallback(c.dragging, ev)
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}
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func (c *mobileCanvas) tapUp(pos fyne.Position, tapID int,
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tapCallback func(fyne.Tappable, *fyne.PointEvent),
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tapAltCallback func(fyne.SecondaryTappable, *fyne.PointEvent),
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doubleTapCallback func(fyne.DoubleTappable, *fyne.PointEvent),
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dragCallback func(fyne.Draggable)) {
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if c.dragging != nil {
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dragCallback(c.dragging)
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c.dragging = nil
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return
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}
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duration := time.Since(c.lastTapDown[tapID])
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if c.menu != nil && c.Overlays().Top() == nil && pos.X > c.menu.Size().Width {
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c.menu.Hide()
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c.menu.Refresh()
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c.setMenu(nil)
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return
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}
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co, objPos, _ := c.findObjectAtPositionMatching(pos, func(object fyne.CanvasObject) bool {
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if _, ok := object.(fyne.Tappable); ok {
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return true
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} else if _, ok := object.(fyne.SecondaryTappable); ok {
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return true
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} else if _, ok := object.(mobile.Touchable); ok {
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return true
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} else if _, ok := object.(fyne.DoubleTappable); ok {
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return true
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}
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return false
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})
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if wid, ok := co.(mobile.Touchable); ok {
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touchEv := &mobile.TouchEvent{}
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touchEv.Position = objPos
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touchEv.AbsolutePosition = pos
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wid.TouchUp(touchEv)
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c.touched[tapID] = nil
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}
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ev := &fyne.PointEvent{
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Position: objPos,
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AbsolutePosition: pos,
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}
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if duration < tapSecondaryDelay {
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_, doubleTap := co.(fyne.DoubleTappable)
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if doubleTap {
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c.touchTapCount++
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c.touchLastTapped = co
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if c.touchCancelFunc != nil {
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c.touchCancelFunc()
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return
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}
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go c.waitForDoubleTap(co, ev, tapCallback, doubleTapCallback)
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} else {
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if wid, ok := co.(fyne.Tappable); ok {
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tapCallback(wid, ev)
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}
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}
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} else {
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if wid, ok := co.(fyne.SecondaryTappable); ok {
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tapAltCallback(wid, ev)
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}
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}
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}
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func (c *mobileCanvas) waitForDoubleTap(co fyne.CanvasObject, ev *fyne.PointEvent, tapCallback func(fyne.Tappable, *fyne.PointEvent), doubleTapCallback func(fyne.DoubleTappable, *fyne.PointEvent)) {
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var ctx context.Context
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ctx, c.touchCancelFunc = context.WithDeadline(context.TODO(), time.Now().Add(time.Millisecond*doubleClickDelay))
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defer c.touchCancelFunc()
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<-ctx.Done()
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if c.touchTapCount == 2 && c.touchLastTapped == co {
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if wid, ok := co.(fyne.DoubleTappable); ok {
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doubleTapCallback(wid, ev)
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}
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} else {
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if wid, ok := co.(fyne.Tappable); ok {
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tapCallback(wid, ev)
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}
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}
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c.touchTapCount = 0
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c.touchCancelFunc = nil
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c.touchLastTapped = nil
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}
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