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[Android] sticky title on TimetableGrid #1262

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[Android] sticky title on TimetableGrid #1262

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1a1d25e
enable to see title when scroll TimetableGrid
ked4ma Sep 16, 2023
dab05ec
add screenshot tests for stiky title
ked4ma Sep 17, 2023
4cdfbd5
fix format
ked4ma Sep 17, 2023
38623d1
Merge branch 'main' into feature/sticky-timetable-grid-title
ked4ma Sep 17, 2023
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47 changes: 42 additions & 5 deletions .../src/main/java/io/github/droidkaigi/confsched2023/sessions/component/TimetableGridItem.kt
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Original file line number Diff line number Diff line change
Expand Up @@ -10,6 +10,7 @@ import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.Row
import androidx.compose.foundation.layout.Spacer
import androidx.compose.foundation.layout.height
import androidx.compose.foundation.layout.offset
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.size
import androidx.compose.foundation.layout.width
Expand All @@ -23,16 +24,25 @@ import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.Surface
import androidx.compose.material3.Text
import androidx.compose.runtime.Composable
import androidx.compose.runtime.derivedStateOf
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableFloatStateOf
import androidx.compose.runtime.mutableIntStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.setValue
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.draw.clip
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.graphics.vector.rememberVectorPainter
import androidx.compose.ui.layout.onGloballyPositioned
import androidx.compose.ui.layout.positionInParent
import androidx.compose.ui.platform.LocalDensity
import androidx.compose.ui.text.TextStyle
import androidx.compose.ui.text.style.TextOverflow
import androidx.compose.ui.tooling.preview.PreviewParameter
import androidx.compose.ui.unit.Density
import androidx.compose.ui.unit.IntOffset
import androidx.compose.ui.unit.TextUnit
import androidx.compose.ui.unit.dp
import androidx.compose.ui.unit.sp
Expand Down Expand Up @@ -104,6 +114,21 @@ fun TimetableGridItem(
it.copy(fontSize = titleFontSize, lineHeight = titleLineHeight, color = textColor)
}

var displayedPosition by remember { mutableFloatStateOf(0f) }
var itemHeight by remember { mutableIntStateOf(0) }
var titleHeight by remember { mutableIntStateOf(0) }
var timeHeight by remember { mutableIntStateOf(0) }
var speakerHeight by remember { mutableIntStateOf(0) }
Comment on lines +117 to +121
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@ked4ma ked4ma Sep 16, 2023 •
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theere are possibility that height of column composable for title, time speaker have a variety of values according to session name.
And it was difficult to use spacer to get a room of item (due to weight and so on).
so here, getting each height and calculating maxOffset from these values.

val titleOffset by remember(localDensity) {
derivedStateOf {
// [available height] - [height already in use]
val maxOffset = with(localDensity) {
itemHeight - (titleHeight + timeHeight + speakerHeight + TimetableGridItemSizes.titleToSchedulePadding.roundToPx())
}.coerceAtLeast(0)
displayedPosition.unaryMinus().toInt().coerceIn(0, maxOffset)
}
}

Column(
modifier = modifier
.background(
Expand All @@ -119,14 +144,22 @@ fun TimetableGridItem(
.clickable {
onTimetableItemClick(timetableItem)
}
.padding(TimetableGridItemSizes.padding),
.padding(TimetableGridItemSizes.padding)
.onGloballyPositioned {
displayedPosition = it.positionInParent().y
itemHeight = it.size.height
},
) {
Column(
modifier = Modifier.weight(3f),
modifier = Modifier
.weight(3f)
.offset { IntOffset(0, titleOffset) },
verticalArrangement = Arrangement.Top,
) {
Text(
modifier = Modifier.weight(1f, fill = false),
modifier = Modifier
.weight(1f, fill = false)
.onGloballyPositioned { titleHeight = it.size.height },
text = timetableItem.title.currentLangTitle,
style = titleTextStyle,
overflow = TextOverflow.Ellipsis,
Expand All @@ -135,7 +168,8 @@ fun TimetableGridItem(
Row(
modifier = Modifier
.weight(1f, fill = false)
.padding(top = TimetableGridItemSizes.titleToSchedulePadding),
.padding(top = TimetableGridItemSizes.titleToSchedulePadding)
.onGloballyPositioned { timeHeight = it.size.height },
) {
Icon(
modifier = Modifier.height(TimetableGridItemSizes.scheduleHeight),
Expand Down Expand Up @@ -168,7 +202,10 @@ fun TimetableGridItem(
verticalAlignment = Alignment.CenterVertically,
) {
if (speakers.isNotEmpty()) {
val speakerModifier = Modifier.weight(1f)
val speakerModifier =
Modifier
.weight(1f)
.onGloballyPositioned { speakerHeight = it.size.height }
if (speakers.size == 1) {
var speakerTextStyle = MaterialTheme.typography.labelMedium
if (titleTextStyle.fontSize < speakerTextStyle.fontSize) {
Expand Down
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