Method UpdateLogScroll

src/script/script_gui.cpp:905–934

* Update the scrollbar and scroll position of the log panel. */

	 * Update the scrollbar and scroll position of the log panel.
	 */
	void UpdateLogScroll()
	{
		this->SetWidgetsDisabledState(this->filter.script_debug_company == CompanyID::Invalid(), WID_SCRD_VSCROLLBAR, WID_SCRD_HSCROLLBAR);
		if (this->filter.script_debug_company == CompanyID::Invalid()) return;

		ScriptLogTypes::LogData &log = this->GetLogData();

		int scroll_count = static_cast<int>(log.size());
		if (this->vscroll->GetCount() != scroll_count) {
			this->vscroll->SetCount(scroll_count);

			/* We need a repaint */
			this->SetWidgetDirty(WID_SCRD_VSCROLLBAR);
		}

		if (log.empty()) return;

		/* Detect when the user scrolls the window. Enable autoscroll when the bottom-most line becomes visible. */
		if (this->last_vscroll_pos != this->vscroll->GetPosition()) {
			this->autoscroll = this->vscroll->GetPosition() + this->vscroll->GetCapacity() >= static_cast<int>(log.size());
		}

		if (this->autoscroll && this->vscroll->SetPosition(static_cast<int>(log.size()))) {
			/* We need a repaint */
			this->SetWidgetDirty(WID_SCRD_VSCROLLBAR);
			this->SetWidgetDirty(WID_SCRD_LOG_PANEL);
		}

		this->last_vscroll_pos = this->vscroll->GetPosition();
	}

	/**
	 * Update state of all Company (AI) buttons.