Add jump-to-row functionality to data grid: implement input handling, validation, event wiring, UI integration, and test coverage.

Author: mike-ward

_data_source_test.v

@@ -195,6 +195,45 @@ fn test_data_grid_source_rows_text_cursor_opaque_fallback() {
 	assert text == 'Rows 220/50000'
 }
 
+fn test_data_grid_source_row_position_text_offset() {
+	cfg := DataGridCfg{
+		id:        'source-row-position'
+		columns:   []
+		rows:      [
+			GridRow{
+				id: '101'
+			},
+			GridRow{
+				id: '102'
+			},
+		]
+		selection: GridSelection{
+			active_row_id: '102'
+		}
+	}
+	state := DataGridSourceState{
+		offset_start: 100
+		row_count:    ?int(500)
+	}
+	assert data_grid_source_row_position_text(cfg, state, .offset) == 'Row 102 of 500'
+}
+
+fn test_data_grid_source_jump_enabled_rules() {
+	cfg := DataGridCfg{
+		id:                  'source-jump'
+		columns:             []
+		rows:                []
+		on_selection_change: fn (_ GridSelection, mut _ Event, mut _ Window) {}
+	}
+	state := DataGridSourceState{
+		row_count: ?int(1000)
+	}
+	assert data_grid_source_jump_enabled(cfg, state, .offset, 200)
+	assert !data_grid_source_jump_enabled(cfg, state, .cursor, 200)
+	state_no_total := DataGridSourceState{}
+	assert !data_grid_source_jump_enabled(cfg, state_no_total, .offset, 200)
+}
+
 fn data_source_rows(count int) []GridRow {
 	mut rows := []GridRow{cap: count}
 	for i in 0 .. count {

_view_data_grid_test.v

@@ -280,6 +280,92 @@ fn test_data_grid_quick_filter_matches_text_with_total() {
 	assert data_grid_quick_filter_matches_text(cfg) == 'Matches 2/50'
 }
 
+fn test_data_grid_jump_digits_and_target_parsing() {
+	assert data_grid_jump_digits('1a-2') == '12'
+	if target := data_grid_parse_jump_target('3', 10) {
+		assert target == 2
+	} else {
+		assert false
+	}
+	if target := data_grid_parse_jump_target('999', 10) {
+		assert target == 9
+	} else {
+		assert false
+	}
+	if _ := data_grid_parse_jump_target('0', 10) {
+		assert false
+	}
+	if _ := data_grid_parse_jump_target('', 10) {
+		assert false
+	}
+}
+
+fn test_data_grid_row_position_text_uses_page_start_without_selection() {
+	mut rows := []GridRow{cap: 100}
+	for i in 0 .. 100 {
+		rows << GridRow{
+			id: '${i + 1}'
+		}
+	}
+	cfg := DataGridCfg{
+		id:        'row-pos-page-start'
+		page_size: 20
+		columns:   []
+		rows:      rows
+	}
+	assert data_grid_row_position_text(cfg, 40, 60, 100) == 'Row 41 of 100'
+}
+
+fn test_data_grid_row_position_text_uses_active_row() {
+	cfg := DataGridCfg{
+		id:        'row-pos-active'
+		columns:   []
+		rows:      [
+			GridRow{
+				id: '1'
+			},
+			GridRow{
+				id: '2'
+			},
+			GridRow{
+				id: '3'
+			},
+		]
+		selection: GridSelection{
+			active_row_id: '2'
+		}
+	}
+	assert data_grid_row_position_text(cfg, 0, 3, 3) == 'Row 2 of 3'
+}
+
+fn test_data_grid_pager_padding_uses_cell_gutter_when_filter_padding_is_zero() {
+	cfg := DataGridCfg{
+		id:             'pager-padding-fallback'
+		columns:        []
+		rows:           []
+		padding_cell:   padding(0, 7, 0, 5)
+		padding_filter: padding_none
+	}
+	pad := data_grid_pager_padding(cfg)
+	assert pad.left == 5
+	assert pad.right == 7
+}
+
+fn test_data_grid_pager_padding_preserves_larger_filter_padding() {
+	cfg := DataGridCfg{
+		id:             'pager-padding-filter'
+		columns:        []
+		rows:           []
+		padding_cell:   padding(0, 4, 0, 3)
+		padding_filter: padding(2, 10, 1, 8)
+	}
+	pad := data_grid_pager_padding(cfg)
+	assert pad.top == 2
+	assert pad.bottom == 1
+	assert pad.left == 8
+	assert pad.right == 10
+}
+
 fn test_data_grid_scroll_padding_visible() {
 	cfg := DataGridCfg{
 		id:      'padding-visible'

examples/data_grid_data_source_demo.v

@@ -79,6 +79,7 @@ fn main_view(mut window gui.Window) gui.View {
 			window.data_grid(
 				id:                  'source-grid'
 				max_height:          620
+				show_quick_filter:   true
 				columns:             app.columns
 				data_source:         app.source
 				pagination_kind:     if app.use_offset {