More Windows Table separation.

1 files changed, 83 insertions, 0 deletions

diff --git a/wintable/selection.h b/wintable/selection.h
new file mode 100644
index 0000000..12c30d5
--- /dev/null
+++ b/wintable/selection.h
@@ -0,0 +1,83 @@
+// 30 november 2014
+
+static void finishSelect(struct table *t, intptr_t prev)
+{
+	if (t->selected < 0)
+		t->selected = 0;
+	if (t->selected >= t->count)
+		t->selected = t->count - 1;
+
+	// always redraw the old and new rows to avoid artifacts when scrolling, even if they are the same (since the focused column may have changed)
+	redrawRow(t, prev);
+	if (prev != t->selected)
+		redrawRow(t, t->selected);
+
+	// if we need to scroll, the scrolling will force a redraw, so we don't have to worry about doing so ourselves
+	if (t->selected < t->firstVisible)
+		vscrollto(t, t->selected);
+	// note that this is not lastVisible(t) because the last visible row may only be partially visible and we want selections to make them fully visible
+	else if (t->selected >= (t->firstVisible + t->pagesize))
+		vscrollto(t, t->selected - t->pagesize + 1);
+}
+
+// TODO isolate functionality so other keyboard event handlers can run
+static void keySelect(struct table *t, WPARAM wParam, LPARAM lParam)
+{
+	intptr_t prev;
+
+	// TODO figure out correct behavior with nothing selected
+	if (t->count == 0)		// don't try to do anything if there's nothing to do
+		return;
+	prev = t->selected;
+	switch (wParam) {
+	case VK_UP:
+		t->selected--;
+		break;
+	case VK_DOWN:
+		t->selected++;
+		break;
+	case VK_PRIOR:
+		t->selected -= t->pagesize;
+		break;
+	case VK_NEXT:
+		t->selected += t->pagesize;
+		break;
+	case VK_HOME:
+		t->selected = 0;
+		break;
+	case VK_END:
+		t->selected = t->count - 1;
+		break;
+	case VK_LEFT:
+		t->focusedColumn--;
+		if (t->focusedColumn < 0)
+			if (t->nColumns == 0)		// peg at -1
+				t->focusedColumn = -1;
+			else
+				t->focusedColumn = 0;
+		break;
+	case VK_RIGHT:
+		t->focusedColumn++;
+		if (t->focusedColumn >= t->nColumns)
+			if (t->nColumns == 0)		// peg at -1
+				t->focusedColumn = -1;
+			else
+				t->focusedColumn = t->nColumns - 1;
+		break;
+	// TODO keyboard shortcuts for going to the first/last column?
+	default:
+		// don't touch anything
+		return;
+	}
+	finishSelect(t, prev);
+}
+
+// TODO rename
+static void selectItem(struct table *t, WPARAM wParam, LPARAM lParam)
+{
+	intptr_t prev;
+
+	prev = t->selected;
+	lParamToRowColumn(t, lParam, &(t->selected), &(t->focusedColumn));
+	finishSelect(t, prev);
+}