Added Table.Selected()/Table.Select() and implemented them on Windows.

redo/table.go

@@ -39,7 +39,13 @@ type Table interface {
 
 	// LoadImageList loads the given ImageList into the Table.
 	// This function copies; changes to the ImageList made later will not be reflected by the Table.
-	LoadImageList(ImageList)
+	LoadImageList(imagelist ImageList)
+
+	// Selected and Select get and set the currently selected item in the Table.
+	// Selected returns -1 if no item is selected.
+	// Pass -1 to Select to deselect all items.
+	Selected() int
+	Select(index int)
 }
 
 type tablebase struct {

redo/table_windows.c

@@ -122,3 +122,33 @@ void tableSetCheckboxImageList(HWND hwnd)
 	if (SendMessageW(hwnd, LVM_SETCALLBACKMASK, LVIS_STATEIMAGEMASK, 0) == FALSE)
 		xpanic("error marking state image list as application-managed", GetLastError());
 }
+
+// because Go won't let me do C.WPARAM(-1)
+intptr_t tableSelectedItem(HWND hwnd)
+{
+	return (intptr_t) SendMessageW(hwnd, LVM_GETNEXTITEM, (WPARAM) -1, LVNI_SELECTED);
+}
+
+void tableSelectItem(HWND hwnd, intptr_t index)
+{
+	LVITEMW item;
+	LRESULT current;
+
+	// via http://support.microsoft.com/kb/131284
+	// we don't need to clear the other bits; Tables don't support cutting or drag/drop
+	current = SendMessageW(hwnd, LVM_GETNEXTITEM, (WPARAM) -1, LVNI_SELECTED);
+	if (current != (LRESULT) -1) {
+		ZeroMemory(&item, sizeof (LVITEMW));
+		item.mask = LVIF_STATE;
+		item.state = 0;
+		item.stateMask = LVIS_FOCUSED | LVIS_SELECTED;
+		if (SendMessageW(hwnd, LVM_SETITEMSTATE, (WPARAM) current, (LPARAM) (&item)) == FALSE)
+			xpanic("error deselecting current Table item", GetLastError());
+	}
+	ZeroMemory(&item, sizeof (LVITEMW));
+	item.mask = LVIF_STATE;
+	item.state = LVIS_FOCUSED | LVIS_SELECTED;
+	item.stateMask = LVIS_FOCUSED | LVIS_SELECTED;
+	if (SendMessageW(hwnd, LVM_SETITEMSTATE, (WPARAM) index, (LPARAM) (&item)) == FALSE)
+		xpanic("error selecting new Table item", GetLastError());
+}

redo/table_windows.go

@@ -62,6 +62,18 @@ func (t *table) LoadImageList(il ImageList) {
 	il.apply(t._hwnd, C.LVM_SETIMAGELIST, C.LVSIL_SMALL)
 }
 
+func (t *table) Selected() int {
+	t.RLock()
+	defer t.RUnlock()
+	return int(C.tableSelectedItem(t._hwnd))
+}
+
+func (t *table) Select(index int) {
+	t.RLock()
+	defer t.RUnlock()
+	C.tableSelectItem(t._hwnd, C.intptr_t(index))
+}
+
 //export tableGetCell
 func tableGetCell(data unsafe.Pointer, item *C.LVITEMW) {
 	t := (*table)(data)

redo/winapi_windows.h

@@ -105,6 +105,8 @@ extern void tableUpdate(HWND, int);
 extern void tableAddExtendedStyles(HWND, LPARAM);
 extern void tableAutosizeColumns(HWND, int);
 extern void tableSetCheckboxImageList(HWND);
+extern intptr_t tableSelectedItem(HWND);
+extern void tableSelectItem(HWND, intptr_t);
 
 // container_windows.c
 extern DWORD makeContainerWindowClass(char **);