Fix time snapping for event drag operations in week view

- Apply snapping to final event position after accounting for click offset
- Ensure preview position matches snapped final position
- Maintain time increment alignment during drag operations
- Fix scope issue for time_increment in mouseup handler

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/components/week_view.rs

@@ -32,6 +32,8 @@ pub struct WeekViewProps {
 enum DragType {
     CreateEvent,
     MoveEvent(CalendarEvent),
+    ResizeEventStart(CalendarEvent), // Resizing from the top edge (start time)
+    ResizeEventEnd(CalendarEvent),   // Resizing from the bottom edge (end time)
 }
 
 #[derive(Clone, PartialEq)]
@@ -42,6 +44,7 @@ struct DragState {
     start_y: f64,
     current_y: f64,
     offset_y: f64, // For event moves, this is the offset from the event's top
+    has_moved: bool, // Track if we've moved enough to constitute a real drag
 }
 
 #[function_component(WeekView)]
@@ -161,6 +164,7 @@ pub fn week_view(props: &WeekViewProps) -> Html {
                                             start_y: snapped_y,
                                             current_y: snapped_y,
                                             offset_y: 0.0,
+                                            has_moved: false,
                                         }));
                                         e.prevent_default();
                                     })
@@ -173,11 +177,21 @@ pub fn week_view(props: &WeekViewProps) -> Html {
                                         if let Some(mut current_drag) = (*drag_state).clone() {
                                             if current_drag.is_dragging {
                                                 // Use layer_y for consistent coordinate calculation
-                                                let relative_y = e.layer_y() as f64;
-                                                let relative_y = if relative_y > 0.0 { relative_y } else { e.offset_y() as f64 };
+                                                let mouse_y = e.layer_y() as f64;
+                                                let mouse_y = if mouse_y > 0.0 { mouse_y } else { e.offset_y() as f64 };
+                                                
+                                                // For move operations, we now follow the mouse directly since we start at click position
+                                                // For resize operations, we still use the mouse position directly
+                                                let adjusted_y = mouse_y;
                                                 
                                                 // Snap to increment
-                                                let snapped_y = snap_to_increment(relative_y, time_increment);
+                                                let snapped_y = snap_to_increment(adjusted_y, time_increment);
+                                                
+                                                // Check if we've moved enough to constitute a real drag (5 pixels minimum)
+                                                let movement_distance = (snapped_y - current_drag.start_y).abs();
+                                                if movement_distance > 5.0 {
+                                                    current_drag.has_moved = true;
+                                                }
                                                 
                                                 current_drag.current_y = snapped_y;
                                                 drag_state.set(Some(current_drag));
@@ -190,9 +204,10 @@ pub fn week_view(props: &WeekViewProps) -> Html {
                                     let drag_state = drag_state_clone.clone();
                                     let on_create_event = props.on_create_event.clone();
                                     let on_event_update = props.on_event_update.clone();
+                                    let time_increment = props.time_increment;
                                     Callback::from(move |_e: MouseEvent| {
                                         if let Some(current_drag) = (*drag_state).clone() {
-                                            if current_drag.is_dragging {
+                                            if current_drag.is_dragging && current_drag.has_moved {
                                                 match &current_drag.drag_type {
                                                     DragType::CreateEvent => {
                                                         // Calculate start and end times
@@ -221,8 +236,11 @@ pub fn week_view(props: &WeekViewProps) -> Html {
                                                         }
                                                     },
                                                     DragType::MoveEvent(event) => {
-                                                        // Calculate new start time based on drag position
-                                                        let new_start_time = pixels_to_time(current_drag.current_y);
+                                                        // Calculate new start time based on drag position (accounting for click offset)
+                                                        let unsnapped_position = current_drag.current_y - current_drag.offset_y;
+                                                        // Snap the final position to maintain time increment alignment
+                                                        let event_top_position = snap_to_increment(unsnapped_position, time_increment);
+                                                        let new_start_time = pixels_to_time(event_top_position);
                                                         
                                                         // Calculate duration from original event
                                                         let original_duration = if let Some(end) = event.end {
@@ -234,6 +252,51 @@ pub fn week_view(props: &WeekViewProps) -> Html {
                                                         let new_start_datetime = NaiveDateTime::new(current_drag.start_date, new_start_time);
                                                         let new_end_datetime = new_start_datetime + original_duration;
                                                         
+                                                        if let Some(callback) = &on_event_update {
+                                                            callback.emit((event.clone(), new_start_datetime, new_end_datetime));
+                                                        }
+                                                    },
+                                                    DragType::ResizeEventStart(event) => {
+                                                        // Calculate new start time based on drag position
+                                                        let new_start_time = pixels_to_time(current_drag.current_y);
+                                                        
+                                                        // Keep the original end time
+                                                        let original_end = if let Some(end) = event.end {
+                                                            end.with_timezone(&chrono::Local).naive_local()
+                                                        } else {
+                                                            // If no end time, use start time + 1 hour as default
+                                                            event.start.with_timezone(&chrono::Local).naive_local() + chrono::Duration::hours(1)
+                                                        };
+                                                        
+                                                        let new_start_datetime = NaiveDateTime::new(current_drag.start_date, new_start_time);
+                                                        
+                                                        // Ensure start is before end (minimum 15 minutes)
+                                                        let new_end_datetime = if new_start_datetime >= original_end {
+                                                            new_start_datetime + chrono::Duration::minutes(15)
+                                                        } else {
+                                                            original_end
+                                                        };
+                                                        
+                                                        if let Some(callback) = &on_event_update {
+                                                            callback.emit((event.clone(), new_start_datetime, new_end_datetime));
+                                                        }
+                                                    },
+                                                    DragType::ResizeEventEnd(event) => {
+                                                        // Calculate new end time based on drag position
+                                                        let new_end_time = pixels_to_time(current_drag.current_y);
+                                                        
+                                                        // Keep the original start time
+                                                        let original_start = event.start.with_timezone(&chrono::Local).naive_local();
+                                                        
+                                                        let new_end_datetime = NaiveDateTime::new(current_drag.start_date, new_end_time);
+                                                        
+                                                        // Ensure end is after start (minimum 15 minutes)
+                                                        let new_start_datetime = if new_end_datetime <= original_start {
+                                                            new_end_datetime - chrono::Duration::minutes(15)
+                                                        } else {
+                                                            original_start
+                                                        };
+                                                        
                                                         if let Some(callback) = &on_event_update {
                                                             callback.emit((event.clone(), new_start_datetime, new_end_datetime));
                                                         }
@@ -297,36 +360,39 @@ pub fn week_view(props: &WeekViewProps) -> Html {
                                                         let drag_state = drag_state.clone();
                                                         let event_for_drag = event.clone();
                                                         let date_for_drag = *date;
-                                                        let time_increment = props.time_increment;
+                                                        let _time_increment = props.time_increment;
                                                         Callback::from(move |e: MouseEvent| {
                                                             e.stop_propagation(); // Prevent drag-to-create from starting on event clicks
                                                             
-                                                            // Only handle left-click (button 0)
+                                                            // Only handle left-click (button 0) for moving
                                                             if e.button() != 0 {
                                                                 return;
                                                             }
                                                             
-                                                            // Calculate Y position relative to the day column
-                                                            let relative_y = e.layer_y() as f64;
-                                                            let relative_y = if relative_y > 0.0 { relative_y } else { e.offset_y() as f64 };
+                                                            // Calculate click position relative to event element
+                                                            let click_y_relative = e.layer_y() as f64;
+                                                            let click_y_relative = if click_y_relative > 0.0 { click_y_relative } else { e.offset_y() as f64 };
                                                             
-                                                            // Get event's current position
+                                                            // Get event's current position in day column coordinates
                                                             let (event_start_pixels, _, _) = calculate_event_position(&event_for_drag, date_for_drag);
                                                             let event_start_pixels = event_start_pixels as f64;
                                                             
-                                                            // Calculate offset from the top of the event
-                                                            let offset_y = relative_y - event_start_pixels;
+                                                            // Convert click position to day column coordinates
+                                                            let click_y = event_start_pixels + click_y_relative;
                                                             
-                                                            // Snap to increment
-                                                            let snapped_y = snap_to_increment(relative_y, time_increment);
+                                                            // Store the offset from the event's top where the user clicked
+                                                            // This will be used to maintain the relative click position
+                                                            let offset_y = click_y_relative;
                                                             
+                                                            // Start drag tracking from where we clicked (in day column coordinates)
                                                             drag_state.set(Some(DragState {
                                                                 is_dragging: true,
                                                                 drag_type: DragType::MoveEvent(event_for_drag.clone()),
                                                                 start_date: date_for_drag,
-                                                                start_y: snapped_y,
-                                                                current_y: snapped_y,
+                                                                start_y: click_y,
+                                                                current_y: click_y,
                                                                 offset_y,
+                                                                has_moved: false,
                                                             }));
                                                             e.prevent_default();
                                                         })
@@ -336,7 +402,16 @@ pub fn week_view(props: &WeekViewProps) -> Html {
                                                         if let Some(callback) = &props.on_event_context_menu {
                                                             let callback = callback.clone();
                                                             let event = event.clone();
+                                                            let drag_state_for_context = drag_state.clone();
                                                             Some(Callback::from(move |e: web_sys::MouseEvent| {
+                                                                // Check if we're currently dragging - if so, prevent context menu
+                                                                if let Some(drag) = (*drag_state_for_context).clone() {
+                                                                    if drag.is_dragging {
+                                                                        e.prevent_default();
+                                                                        return;
+                                                                    }
+                                                                }
+                                                                
                                                                 e.prevent_default();
                                                                 e.stop_propagation(); // Prevent calendar context menu from also triggering
                                                                 callback.emit((e, event.clone()));
@@ -377,12 +452,16 @@ pub fn week_view(props: &WeekViewProps) -> Html {
                                                         }
                                                     };
                                                     
-                                                    // Check if this event is currently being dragged
+                                                    // Check if this event is currently being dragged or resized
                                                     let is_being_dragged = if let Some(drag) = (*drag_state).clone() {
-                                                        if let DragType::MoveEvent(dragged_event) = &drag.drag_type {
-                                                            dragged_event.uid == event.uid && drag.is_dragging
-                                                        } else {
-                                                            false
+                                                        match &drag.drag_type {
+                                                            DragType::MoveEvent(dragged_event) => 
+                                                                dragged_event.uid == event.uid && drag.is_dragging,
+                                                            DragType::ResizeEventStart(dragged_event) => 
+                                                                dragged_event.uid == event.uid && drag.is_dragging,
+                                                            DragType::ResizeEventEnd(dragged_event) => 
+                                                                dragged_event.uid == event.uid && drag.is_dragging,
+                                                            _ => false,
                                                         }
                                                     } else {
                                                         false
@@ -392,6 +471,57 @@ pub fn week_view(props: &WeekViewProps) -> Html {
                                                         // Hide the original event while being dragged
                                                         Some(html! {})
                                                     } else {
+                                                        // Create resize handles for left-click resize
+                                                        let resize_start_handler = {
+                                                            let drag_state = drag_state.clone();
+                                                            let event_for_resize = event.clone();
+                                                            let date_for_drag = *date;
+                                                            let time_increment = props.time_increment;
+                                                            Callback::from(move |e: web_sys::MouseEvent| {
+                                                                e.stop_propagation();
+                                                                
+                                                                let relative_y = e.layer_y() as f64;
+                                                                let relative_y = if relative_y > 0.0 { relative_y } else { e.offset_y() as f64 };
+                                                                let snapped_y = snap_to_increment(relative_y, time_increment);
+                                                                
+                                                                drag_state.set(Some(DragState {
+                                                                    is_dragging: true,
+                                                                    drag_type: DragType::ResizeEventStart(event_for_resize.clone()),
+                                                                    start_date: date_for_drag,
+                                                                    start_y: snapped_y,
+                                                                    current_y: snapped_y,
+                                                                    offset_y: 0.0,
+                                                                    has_moved: false,
+                                                                }));
+                                                                e.prevent_default();
+                                                            })
+                                                        };
+                                                        
+                                                        let resize_end_handler = {
+                                                            let drag_state = drag_state.clone();
+                                                            let event_for_resize = event.clone();
+                                                            let date_for_drag = *date;
+                                                            let time_increment = props.time_increment;
+                                                            Callback::from(move |e: web_sys::MouseEvent| {
+                                                                e.stop_propagation();
+                                                                
+                                                                let relative_y = e.layer_y() as f64;
+                                                                let relative_y = if relative_y > 0.0 { relative_y } else { e.offset_y() as f64 };
+                                                                let snapped_y = snap_to_increment(relative_y, time_increment);
+                                                                
+                                                                drag_state.set(Some(DragState {
+                                                                    is_dragging: true,
+                                                                    drag_type: DragType::ResizeEventEnd(event_for_resize.clone()),
+                                                                    start_date: date_for_drag,
+                                                                    start_y: snapped_y,
+                                                                    current_y: snapped_y,
+                                                                    offset_y: 0.0,
+                                                                    has_moved: false,
+                                                                }));
+                                                                e.prevent_default();
+                                                            })
+                                                        };
+                                                        
                                                         Some(html! {
                                                             <div 
                                                                 class={classes!(
@@ -409,9 +539,36 @@ pub fn week_view(props: &WeekViewProps) -> Html {
                                                                 {oncontextmenu}
                                                                 onmousedown={onmousedown_event}
                                                             >
-                                                                <div class="event-title">{event.summary.as_ref().unwrap_or(&"Untitled".to_string())}</div>
+                                                                // Top resize handle
                                                                 {if !is_all_day {
-                                                                    html! { <div class="event-time">{time_display}</div> }
+                                                                    html! {
+                                                                        <div 
+                                                                            class="resize-handle resize-handle-top"
+                                                                            onmousedown={resize_start_handler}
+                                                                        />
+                                                                    }
+                                                                } else {
+                                                                    html! {}
+                                                                }}
+                                                                
+                                                                // Event content
+                                                                <div class="event-content">
+                                                                    <div class="event-title">{event.summary.as_ref().unwrap_or(&"Untitled".to_string())}</div>
+                                                                    {if !is_all_day {
+                                                                        html! { <div class="event-time">{time_display}</div> }
+                                                                    } else {
+                                                                        html! {}
+                                                                    }}
+                                                                </div>
+                                                                
+                                                                // Bottom resize handle
+                                                                {if !is_all_day {
+                                                                    html! {
+                                                                        <div 
+                                                                            class="resize-handle resize-handle-bottom"
+                                                                            onmousedown={resize_end_handler}
+                                                                        />
+                                                                    }
                                                                 } else {
                                                                     html! {}
                                                                 }}
@@ -446,8 +603,11 @@ pub fn week_view(props: &WeekViewProps) -> Html {
                                                             }
                                                         },
                                                         DragType::MoveEvent(event) => {
-                                                            // Show the event being moved at its new position
-                                                            let new_start_time = pixels_to_time(drag.current_y);
+                                                            // Calculate the event's new position accounting for click offset
+                                                            let unsnapped_position = drag.current_y - drag.offset_y;
+                                                            // Snap the final position to maintain time increment alignment
+                                                            let preview_position = snap_to_increment(unsnapped_position, props.time_increment);
+                                                            let new_start_time = pixels_to_time(preview_position);
                                                             let original_duration = if let Some(end) = event.end {
                                                                 end.signed_duration_since(event.start)
                                                             } else {
@@ -461,12 +621,64 @@ pub fn week_view(props: &WeekViewProps) -> Html {
                                                             html! {
                                                                 <div
                                                                     class="temp-event-box moving-event"
-                                                                    style={format!("top: {}px; height: {}px; background-color: {}; opacity: 0.7;", drag.current_y, duration_pixels, event_color)}
+                                                                    style={format!("top: {}px; height: {}px; background-color: {}; opacity: 0.7;", preview_position, duration_pixels, event_color)}
                                                                 >
                                                                     <div class="event-title">{event.summary.as_ref().unwrap_or(&"Untitled".to_string())}</div>
                                                                     <div class="event-time">{format!("{} - {}", new_start_time.format("%I:%M %p"), new_end_time.format("%I:%M %p"))}</div>
                                                                 </div>
                                                             }
+                                                        },
+                                                        DragType::ResizeEventStart(event) => {
+                                                            // Show the event being resized from the start
+                                                            let new_start_time = pixels_to_time(drag.current_y);
+                                                            let original_end = if let Some(end) = event.end {
+                                                                end.with_timezone(&chrono::Local).naive_local()
+                                                            } else {
+                                                                event.start.with_timezone(&chrono::Local).naive_local() + chrono::Duration::hours(1)
+                                                            };
+                                                            
+                                                            // Calculate positions for the preview
+                                                            let (original_start_pixels, _, _) = calculate_event_position(event, drag.start_date);
+                                                            let original_duration = original_end.signed_duration_since(event.start.with_timezone(&chrono::Local).naive_local());
+                                                            let original_end_pixels = original_start_pixels + (original_duration.num_minutes() as f32);
+                                                            
+                                                            let new_start_pixels = drag.current_y;
+                                                            let new_height = (original_end_pixels as f64 - new_start_pixels).max(20.0);
+                                                            
+                                                            let event_color = get_event_color(event);
+                                                            
+                                                            html! {
+                                                                <div
+                                                                    class="temp-event-box resizing-event"
+                                                                    style={format!("top: {}px; height: {}px; background-color: {}; opacity: 0.7;", new_start_pixels, new_height, event_color)}
+                                                                >
+                                                                    <div class="event-title">{event.summary.as_ref().unwrap_or(&"Untitled".to_string())}</div>
+                                                                    <div class="event-time">{format!("{} - {}", new_start_time.format("%I:%M %p"), original_end.time().format("%I:%M %p"))}</div>
+                                                                </div>
+                                                            }
+                                                        },
+                                                        DragType::ResizeEventEnd(event) => {
+                                                            // Show the event being resized from the end
+                                                            let new_end_time = pixels_to_time(drag.current_y);
+                                                            let original_start = event.start.with_timezone(&chrono::Local).naive_local();
+                                                            
+                                                            // Calculate positions for the preview
+                                                            let (original_start_pixels, _, _) = calculate_event_position(event, drag.start_date);
+                                                            
+                                                            let new_end_pixels = drag.current_y;
+                                                            let new_height = (new_end_pixels - original_start_pixels as f64).max(20.0);
+                                                            
+                                                            let event_color = get_event_color(event);
+                                                            
+                                                            html! {
+                                                                <div
+                                                                    class="temp-event-box resizing-event"
+                                                                    style={format!("top: {}px; height: {}px; background-color: {}; opacity: 0.7;", original_start_pixels, new_height, event_color)}
+                                                                >
+                                                                    <div class="event-title">{event.summary.as_ref().unwrap_or(&"Untitled".to_string())}</div>
+                                                                    <div class="event-time">{format!("{} - {}", original_start.time().format("%I:%M %p"), new_end_time.format("%I:%M %p"))}</div>
+                                                                </div>
+                                                            }
                                                         }
                                                     }
                                                 } else {

styles.css

@@ -727,6 +727,93 @@ body {
     width: 100%;
 }
 
+/* Resizing event during drag */
+.temp-event-box.resizing-event {
+    background: inherit;
+    border: 2px solid rgba(255, 255, 255, 0.9);
+    color: white;
+    flex-direction: column;
+    align-items: flex-start;
+    justify-content: flex-start;
+    text-align: left;
+    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
+    transform: scale(1.01);
+}
+
+.temp-event-box.resizing-event .event-title {
+    font-weight: 600;
+    margin-bottom: 2px;
+    overflow: hidden;
+    text-overflow: ellipsis;
+    white-space: nowrap;
+    width: 100%;
+}
+
+.temp-event-box.resizing-event .event-time {
+    font-size: 0.65rem;
+    opacity: 0.9;
+    overflow: hidden;
+    text-overflow: ellipsis;
+    white-space: nowrap;
+    width: 100%;
+}
+
+/* Event resize zones and handles */
+.week-event {
+    position: relative;
+}
+
+.week-event .event-content {
+    padding: 2px;
+    height: 100%;
+    display: flex;
+    flex-direction: column;
+    justify-content: center;
+    pointer-events: auto;
+    z-index: 5;
+    position: relative;
+}
+
+/* Left-click drag handles */
+.resize-handle {
+    position: absolute;
+    left: 0;
+    right: 0;
+    height: 4px;
+    background: transparent;
+    cursor: ns-resize;
+    z-index: 10;
+    transition: background-color 0.2s;
+}
+
+.resize-handle-top {
+    top: 0;
+    border-top: 2px solid transparent;
+}
+
+.resize-handle-bottom {
+    bottom: 0;
+    border-bottom: 2px solid transparent;
+}
+
+.week-event:hover .resize-handle {
+    background: rgba(255, 255, 255, 0.3);
+}
+
+.week-event:hover .resize-handle-top {
+    border-top-color: rgba(255, 255, 255, 0.8);
+}
+
+.week-event:hover .resize-handle-bottom {
+    border-bottom-color: rgba(255, 255, 255, 0.8);
+}
+
+.resize-handle:hover {
+    background: rgba(255, 255, 255, 0.5) !important;
+    border-color: rgba(255, 255, 255, 1) !important;
+}
+
+
 .week-event .event-title {
     font-weight: 600;
     margin-bottom: 2px;