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feat: Add touch event support for drag-and-drop on mobile devices #17

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Merged
StuartF303 merged 1 commit into from
Nov 11, 2025
Merged

feat: Add touch event support for drag-and-drop on mobile devices #17

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60 changes: 57 additions & 3 deletions src/Frontend/VanDaemon.Web/Pages/Index.razor
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Original file line number Diff line number Diff line change
Expand Up @@ -87,7 +87,11 @@
<!-- Van Diagram Container -->
<div class="diagram-area"
@onmousemove="OnMouseMove"
@onmouseup="OnMouseUp">
@onmouseup="OnMouseUp"
@ontouchmove="OnTouchMove"
@ontouchend="OnTouchEnd"
@ontouchmove:preventDefault="isEditMode"
@ontouchend:preventDefault="isEditMode">
<div class="van-diagram-container" @ref="diagramContainer">
@if (!string.IsNullOrEmpty(backgroundImage))
{
Expand All @@ -106,10 +110,12 @@
@foreach (var overlay in overlays)
{
<div class="overlay-item @(isEditMode ? "edit-mode" : "")"
style="position: absolute; left: @(overlay.X)%; top: @(overlay.Y)%; transform: translate(-50%, -50%); cursor: @(isEditMode ? "move" : "pointer"); user-select: none;"
style="position: absolute; left: @(overlay.X)%; top: @(overlay.Y)%; transform: translate(-50%, -50%); cursor: @(isEditMode ? "move" : "pointer"); user-select: none; touch-action: none;"
@onclick="() => OnOverlayClick(overlay)"
@onmousedown="(e) => OnMouseDown(e, overlay)"
@onmousedown:preventDefault="isEditMode">
@onmousedown:preventDefault="isEditMode"
@ontouchstart="(e) => OnTouchStart(e, overlay)"
@ontouchstart:preventDefault="isEditMode">

@if (overlay.Type == OverlayType.Tank)
{
Expand Down Expand Up @@ -440,6 +446,54 @@
}
}

// Touch event handlers for mobile devices
private void OnTouchStart(TouchEventArgs e, OverlayItem overlay)
{
if (isEditMode && e.Touches.Length > 0)
{
draggedOverlay = overlay;
var touch = e.Touches[0];
dragStartX = touch.ClientX;
dragStartY = touch.ClientY;
}
}

private async Task OnTouchMove(TouchEventArgs e)
{
if (draggedOverlay != null && isEditMode && e.Touches.Length > 0)
{
var touch = e.Touches[0];

// Calculate the change in touch position
double deltaX = touch.ClientX - dragStartX;
double deltaY = touch.ClientY - dragStartY;

// Convert pixel delta to percentage
double deltaXPercent = (deltaX / containerWidth) * 100;
double deltaYPercent = (deltaY / containerHeight) * 100;

// Update overlay position
draggedOverlay.X = Math.Max(0, Math.Min(100, draggedOverlay.X + deltaXPercent));
draggedOverlay.Y = Math.Max(0, Math.Min(100, draggedOverlay.Y + deltaYPercent));

// Update drag start position for next move
dragStartX = touch.ClientX;
dragStartY = touch.ClientY;

await InvokeAsync(StateHasChanged);
}
}

private async Task OnTouchEnd(TouchEventArgs e)
{
if (draggedOverlay != null && isEditMode)
{
// Save position to backend
await SaveOverlayPosition(draggedOverlay);
draggedOverlay = null;
}
}

private async Task OnControlToggle(OverlayItem overlay, bool value)
{
try
Expand Down
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