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Intial stab at this, I'm not sure all the code lives in the right place and looking for feedback on that. Additional issues/questions: - Is there a way to get the 'standard' system keyboard shortcuts for this? - How to detech ctrl/meta + key press? I never saw them detected though I'm testing with the android emulator which does werid things with external keybaords. - keyboard input enabled by default? note: view needs to be focused to start receiving events - configure zoom & pan steps? Fixes #78
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139 changes: 139 additions & 0 deletions
139
zoomable/src/commonMain/kotlin/me/saket/telephoto/zoomable/internal/keyboardActions.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,139 @@ | ||
| package me.saket.telephoto.zoomable.internal | ||
|
|
||
| import androidx.compose.ui.Modifier | ||
| import androidx.compose.ui.geometry.Offset | ||
| import androidx.compose.ui.input.key.Key | ||
| import androidx.compose.ui.input.key.KeyEvent | ||
| import androidx.compose.ui.input.key.KeyEventType | ||
| import androidx.compose.ui.input.key.KeyInputModifierNode | ||
| import androidx.compose.ui.input.key.isCtrlPressed | ||
| import androidx.compose.ui.input.key.isMetaPressed | ||
| import androidx.compose.ui.input.key.key | ||
| import androidx.compose.ui.input.key.type | ||
| import androidx.compose.ui.node.ModifierNodeElement | ||
| import androidx.compose.ui.unit.Density | ||
| import androidx.compose.ui.unit.Dp | ||
| import androidx.compose.ui.unit.DpOffset | ||
| import androidx.compose.ui.unit.dp | ||
|
|
||
| /** | ||
| * Responds to keyboard events to zoom and pan | ||
| */ | ||
| internal data class KeyboardActionsElement( | ||
| private var zoomStep: Float, | ||
| private var panStep: Dp, | ||
| private var canPan: () -> Boolean, | ||
| private var onZoom: (Float) -> Unit, | ||
| private var onResetZoom: () -> Unit, | ||
| private var onPan: (DpOffset) -> Unit, | ||
| ) : ModifierNodeElement<KeyboardActionsNode>() { | ||
| override fun create(): KeyboardActionsNode { | ||
| return KeyboardActionsNode( | ||
| zoomStep = zoomStep, | ||
| panStep = panStep, | ||
| canPan = canPan, | ||
| onZoom = onZoom, | ||
| onResetZoom = onResetZoom, | ||
| onPan = onPan, | ||
| ) | ||
| } | ||
|
|
||
| override fun update(node: KeyboardActionsNode) { | ||
| node.update( | ||
| zoomStep = zoomStep, | ||
| panStep = panStep, | ||
| canPan = canPan, | ||
| onZoom = onZoom, | ||
| onResetZoom = onResetZoom, | ||
| onPan = onPan, | ||
| ) | ||
| } | ||
| } | ||
|
|
||
| internal class KeyboardActionsNode( | ||
| private var zoomStep: Float, | ||
| private var panStep: Dp, | ||
| private var canPan: () -> Boolean, | ||
| private var onZoom: (Float) -> Unit, | ||
| private var onResetZoom: () -> Unit, | ||
| private var onPan: (DpOffset) -> Unit, | ||
| ) : Modifier.Node(), KeyInputModifierNode { | ||
| override fun onKeyEvent(event: KeyEvent): Boolean { | ||
| //TODO: how to detect the correct key combos? | ||
| println("onKeyEvent: ${event.key} isCtrlPressed=${event.isCtrlPressed} isMetaPressed:${event.isMetaPressed}") | ||
| when { | ||
| event.key == Key.ZoomIn || event.key == Key.Plus || event.key == Key.Equals -> { | ||
| if (event.type == KeyEventType.KeyDown) { | ||
| onZoom(zoomStep) | ||
| } | ||
| return true | ||
| } | ||
| event.key == Key.ZoomOut || event.key == Key.Minus -> { | ||
| if (event.type == KeyEventType.KeyDown) { | ||
| onZoom(1 / zoomStep) | ||
| } | ||
| return true | ||
| } | ||
| event.key == Key.Zero -> { | ||
| if (event.type == KeyEventType.KeyDown) { | ||
| onResetZoom() | ||
| } | ||
| return true | ||
| } | ||
| } | ||
| if (canPan()) { | ||
| when (event.key) { | ||
| Key.DirectionUp -> { | ||
| val offset = DpOffset(x = 0.dp, y = -panStep) | ||
| if (event.type == KeyEventType.KeyDown) { | ||
| onPan(offset) | ||
| } | ||
| return true | ||
| } | ||
| Key.DirectionDown -> { | ||
| val offset = DpOffset(x = 0.dp, y = panStep) | ||
| if (event.type == KeyEventType.KeyDown) { | ||
| onPan(offset) | ||
| } | ||
| return true | ||
| } | ||
| Key.DirectionLeft -> { | ||
| val offset = DpOffset(x = -panStep, y = 0.dp) | ||
| if (event.type == KeyEventType.KeyDown) { | ||
| onPan(offset) | ||
| } | ||
| return true | ||
| } | ||
| Key.DirectionRight -> { | ||
| val offset = DpOffset(x = panStep, y = 0.dp) | ||
| if (event.type == KeyEventType.KeyDown) { | ||
| onPan(offset) | ||
| } | ||
| return true | ||
| } | ||
| } | ||
| } | ||
| return false | ||
| } | ||
|
|
||
| override fun onPreKeyEvent(event: KeyEvent): Boolean { | ||
| return false | ||
| } | ||
|
|
||
| fun update( | ||
| zoomStep: Float, | ||
| panStep: Dp, | ||
| canPan: () -> Boolean, | ||
| onZoom: (Float) -> Unit, | ||
| onResetZoom: () -> Unit, | ||
| onPan: (DpOffset) -> Unit, | ||
| ) { | ||
| this.zoomStep = zoomStep | ||
| this.panStep = panStep | ||
| this.canPan = canPan | ||
| this.zoomStep = zoomStep | ||
| this.onZoom = onZoom | ||
| this.onResetZoom = onResetZoom | ||
| this.onPan = onPan | ||
| } | ||
| } |