C++ (Cpp) BButton::ResizeBy示例

示例#1

void
TFilePanel::SetButtonLabel(file_panel_button selector, const char* text)
{
	switch (selector) {
		case B_CANCEL_BUTTON:
			{
				BButton* button
					= dynamic_cast<BButton*>(FindView("cancel button"));
				if (button == NULL)
					break;

				float old_width = button->StringWidth(button->Label());
				button->SetLabel(text);
				float delta = old_width - button->StringWidth(text);
				if (delta) {
					button->MoveBy(delta, 0);
					button->ResizeBy(-delta, 0);
				}
			}
			break;

		case B_DEFAULT_BUTTON:
			{
				fButtonText = text;
				float delta = 0;
				BButton* button
					= dynamic_cast<BButton*>(FindView("default button"));
				if (button != NULL) {
					float old_width = button->StringWidth(button->Label());
					button->SetLabel(text);
					delta = old_width - button->StringWidth(text);
					if (delta) {
						button->MoveBy(delta, 0);
						button->ResizeBy(-delta, 0);
					}
				}

				// now must move cancel button
				button = dynamic_cast<BButton*>(FindView("cancel button"));
				if (button != NULL)
					button->MoveBy(delta, 0);
			}
			break;
	}
}