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-rw-r--r-- | sd/source/ui/slidesorter/inc/controller/SlsScrollBarManager.hxx | 248 |
1 files changed, 248 insertions, 0 deletions
diff --git a/sd/source/ui/slidesorter/inc/controller/SlsScrollBarManager.hxx b/sd/source/ui/slidesorter/inc/controller/SlsScrollBarManager.hxx new file mode 100644 index 000000000..853d98f4a --- /dev/null +++ b/sd/source/ui/slidesorter/inc/controller/SlsScrollBarManager.hxx @@ -0,0 +1,248 @@ +/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ +/* + * This file is part of the LibreOffice project. + * + * This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. + * + * This file incorporates work covered by the following license notice: + * + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed + * with this work for additional information regarding copyright + * ownership. The ASF licenses this file to you under the Apache + * License, Version 2.0 (the "License"); you may not use this file + * except in compliance with the License. You may obtain a copy of + * the License at http://www.apache.org/licenses/LICENSE-2.0 . + */ + +#pragma once + +#include <tools/link.hxx> +#include <tools/gen.hxx> +#include <vcl/timer.hxx> +#include <vcl/scrbar.hxx> +#include <vcl/vclptr.hxx> + +#include <functional> + +namespace sd { class Window; } + +namespace sd::slidesorter { class SlideSorter; } + +namespace sd::slidesorter::controller { + +/** Manage the horizontal and vertical scroll bars. Listen for events, set + their sizes, place them in the window, determine their visibilities. + + <p>Handle auto scrolling, i.e. the scrolling of the window when the + mouse comes near the window border while dragging a selection.</p> + + <p>In order to make the slide sorter be used in the task pane with its + own vertical scrollbars the vertical scrollbar of the use of the slide + sorter is optional. When using it the available area in a window is + used and the vertical scrollbar is displayed when that area is not large + enough. When the vertical scrollbar is not used then the available area + is assumed to be modifiable. In that case the PlaceScrollBars() method + may return an area larger than the one given.<p> +*/ +class ScrollBarManager +{ +public: + /** Create a new scroll bar manager that manages three controls: the + horizontal scroll bar, the vertical scroll bar, and the little + window that fills the gap at the bottom right corner that is left + between the two scroll bars. Call LateInitialization() after + constructing a new object. + */ + ScrollBarManager (SlideSorter& rSlideSorter); + + ~ScrollBarManager(); + + /** Register listeners at the scroll bars. This method is called after + startup of a new slide sorter object or after a reactivation of a + slide sorter that for example is taken from a cache. + */ + void Connect(); + + /** Remove listeners from the scroll bars. This method is called when + the slide sorter is destroyed or when it is suspended, e.g. put + into a cache for later reuse. + */ + void Disconnect(); + + /** Set up the scroll bar, i.e. thumb size and position. Call this + method when the content of the browser window changed, i.e. pages + were inserted or deleted, the layout or the zoom factor has + changed. + @param bScrollToCurrentPosition + When <TRUE/> then scroll the window to the new offset that is + defined by the scroll bars. Otherwise the new offset is simply + set and the whole window is repainted. + */ + void UpdateScrollBars ( + bool bScrollToCurrentPosition); + + /** Place the scroll bars inside the given area. When the available + area is not large enough for the content to display the horizontal + and/or vertical scroll bar is enabled. + @param rAvailableArea + The scroll bars will be placed inside this rectangle. It is + expected to be given in pixel relative to its parent. + @param bIsHorizontalScrollBarAllowed + Only when this flag is <TRUE/> the horizontal scroll may be + displayed. + @param bIsVerticalScrollBarAllowed + Only when this flag is <TRUE/> the horizontal scroll may be + displayed. + @return + Returns the space that remains after the scroll bars are + placed. + */ + ::tools::Rectangle PlaceScrollBars ( + const ::tools::Rectangle& rAvailableArea, + const bool bIsHorizontalScrollBarAllowed, + const bool bIsVerticalScrollBarAllowed); + + /** Update the vertical and horizontal scroll bars so that the visible + area has the given top and left values. + */ + void SetTopLeft (const Point& rNewTopLeft); + + /** Return the width of the vertical scroll bar, which--when + shown--should be fixed in contrast to its height. + @return + Returns 0 when the vertical scroll bar is not shown or does not + exist, otherwise its width in pixel is returned. + */ + int GetVerticalScrollBarWidth() const; + + /** Return the height of the horizontal scroll bar, which--when + shown--should be fixed in contrast to its width. + @return + Returns 0 when the vertical scroll bar is not shown or does not + exist, otherwise its height in pixel is returned. + */ + int GetHorizontalScrollBarHeight() const; + + /** Call this method to scroll a window while the mouse is in dragging a + selection. If the mouse is near the window border or is outside the + window then scroll the window accordingly. + @param rMouseWindowPosition + The mouse position for which the scroll amount is calculated. + @param rAutoScrollFunctor + Every time when the window is scrolled then this functor is executed. + @return + When the window is scrolled then this method returns <TRUE/>. + When the window is not changed then <FALSE/> is returned. + */ + bool AutoScroll ( + const Point& rMouseWindowPosition, + const ::std::function<void ()>& rAutoScrollFunctor); + + void StopAutoScroll(); + + void clearAutoScrollFunctor(); + + enum Orientation { Orientation_Horizontal, Orientation_Vertical }; + /** Scroll the slide sorter by setting the thumbs of the scroll bars and + by moving the content of the content window. + @param eOrientation + Defines whether to scroll horizontally or vertically. + @param nDistance + distance in slides. + */ + void Scroll( + const Orientation eOrientation, + const sal_Int32 nDistance); + +private: + SlideSorter& mrSlideSorter; + + /** The horizontal scroll bar. Note that is used but not owned by + objects of this class. It is given to the constructor. + */ + VclPtr<ScrollBar> mpHorizontalScrollBar; + + /** The vertical scroll bar. Note that is used but not owned by + objects of this class. It is given to the constructor. + */ + VclPtr<ScrollBar> mpVerticalScrollBar; + + /// Relative horizontal position of the visible area in the view. + double mnHorizontalPosition; + /// Relative vertical position of the visible area in the view. + double mnVerticalPosition; + /** The width and height of the border at the inside of the window which + when entered while in drag mode leads to a scrolling of the window. + */ + Size maScrollBorder; + /** The only task of this little window is to paint the little square at + the bottom right corner left by the two scroll bars (when both are + visible). + */ + VclPtr<ScrollBarBox> mpScrollBarFiller; + + /** The auto scroll timer is used for keep scrolling the window when the + mouse reaches its border while dragging a selection. When the mouse + is not moved the timer issues events to keep scrolling. + */ + Timer maAutoScrollTimer; + Size maAutoScrollOffset; + bool mbIsAutoScrollActive; + + /** The content window is the one whose view port is controlled by the + scroll bars. + */ + VclPtr<sd::Window> mpContentWindow; + + ::std::function<void ()> maAutoScrollFunctor; + + void SetWindowOrigin ( + double nHorizontalPosition, + double nVerticalPosition); + + /** Determine the visibility of the scroll bars so that the window + content is not clipped in any dimension without showing a scroll + bar. + @param rAvailableArea + The area in which the scroll bars, the scroll bar filler, and + the SlideSorterView will be placed. + @return + The area that is enclosed by the scroll bars is returned. It + will be filled with the SlideSorterView. + */ + ::tools::Rectangle DetermineScrollBarVisibilities( + const ::tools::Rectangle& rAvailableArea, + const bool bIsHorizontalScrollBarAllowed, + const bool bIsVerticalScrollBarAllowed); + + /** Typically called by DetermineScrollBarVisibilities() this method + tests a specific configuration of the two scroll bars being visible + or hidden. + @return + When the window content can be shown with only being clipped in + an orientation where the scroll bar would be shown then <TRUE/> + is returned. + */ + bool TestScrollBarVisibilities ( + bool bHorizontalScrollBarVisible, + bool bVerticalScrollBarVisible, + const ::tools::Rectangle& rAvailableArea); + + void CalcAutoScrollOffset (const Point& rMouseWindowPosition); + bool RepeatAutoScroll(); + + DECL_LINK(HorizontalScrollBarHandler, ScrollBar*, void); + DECL_LINK(VerticalScrollBarHandler, ScrollBar*, void); + DECL_LINK(AutoScrollTimeoutHandler, Timer *, void); + + void PlaceHorizontalScrollBar (const ::tools::Rectangle& aArea); + void PlaceVerticalScrollBar (const ::tools::Rectangle& aArea); + void PlaceFiller (const ::tools::Rectangle& aArea); +}; + +} // end of namespace ::sd::slidesorter::controller + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |