f12d3b3477
The cached top coordinate of each BListItem isn't updated when you change the height of the item, leading to confusing highlighting and incorrect mouse clicks. Rather than fixing it, this just documents a workaround or two to force an update of the cached coordinates.
269 lines
5.4 KiB
Plaintext
269 lines
5.4 KiB
Plaintext
/*
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* Copyright 2013 Haiku, Inc. All rights reserved.
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* Distributed under the terms of the MIT License.
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*
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* Authors:
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* John Scipione, jscipione@gmail.com
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*
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* Corresponds to:
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* headers/os/interface/ListItem.h hrev45555
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* src/kits/interface/ListItem.cpp hrev45555
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*/
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/*!
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\file ListItem.h
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\ingroup interface
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\ingroup libbe
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\brief ListItem class definition.
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*/
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/*!
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\class BListItem
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\ingroup interface
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\ingroup libbe
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\brief A list item, a member of a BListView or BOutlineListView.
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\since BeOS R3
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*/
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/*!
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\fn BListItem::BListItem(uint32 level, bool expanded)
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\brief Create a new list item with the specified \a level.
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The \a level and \a expanded arguments are only used if the item is added to
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a BOutlineListView.
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\param level The level to create the list item on, default level is 0.
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\param expanded Whether or not the item is expanded.
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\see BOutlineListView::AddItem()
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\since BeOS R3
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*/
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/*!
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\fn BListItem::BListItem(BMessage* data)
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\brief Create a new list item from archived message.
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\param data The message to create the list item from.
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\since BeOS R3
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*/
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/*!
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\fn BListItem::~BListItem()
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\brief Destroy the list item freeing any memory used.
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The default destructor is empty.
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\since BeOS R3
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*/
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/*!
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\name Archiving
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*/
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//! @{
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/*!
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\fn status_t BListItem::Archive(BMessage* archive, bool deep) const
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\brief Archive the list item to a message.
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\param archive The message to archive the list item to.
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\param deep If \c true also archive child views.
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\since BeOS R3
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*/
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/*!
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\fn void BListItem::DrawItem(BView* owner, BRect frame, bool complete)
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\brief Hook method called when the item is drawn.
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\param owner The view that the list item is a child of.
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\param frame The frame of the item.
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\param complete Whether or not to draw the background in addition to the
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item's contents.
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\since BeOS R3
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*/
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//! @}
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/*!
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\fn float BListItem::Height() const
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\brief Return the height of the list item.
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\return The height of the list item as a float.
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\since BeOS R3
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*/
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/*!
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\fn float BListItem::Width() const
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\brief Return the width of the list item.
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\return The width of the list item as a float.
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\since BeOS R3
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*/
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/*!
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\fn bool BListItem::IsSelected() const
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\brief Return whether or not the list item is currently selected.
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\return \c true if the list item is selected, \c false otherwise.
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\since BeOS R3
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*/
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/*!
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\fn void BListItem::Select()
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\brief Select the list item.
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\since BeOS R3
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*/
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/*!
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\fn void BListItem::Deselect()
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\brief Unselect the list item.
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\since BeOS R3
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*/
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/*!
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\fn void BListItem::SetEnabled(bool on)
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\brief Enable or disable the list item.
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\param on Set \c true to enable, \c false to disable the list item.
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\since BeOS R3
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*/
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/*!
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\fn bool BListItem::IsEnabled() const
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\brief Returns whether or not the list item is currently enabled.
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\return \c true if the list item is enabled, \c false if it is disabled.
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\since BeOS R3
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*/
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/*!
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\fn void BListItem::SetHeight(float height)
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\brief Set the height of the list item to \a height.
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\param height The height to set the list item to.
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\note Unlike BeOS, if you change the height then you need to force
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the BListView to recalculate the cached tops of the item
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selection boxes, otherwise selection highlights will be drawn
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in the wrong places and mouse clicks will be misinterpreted.
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You can do this by adding and removing a dummy BListItem at
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the top of the list, or after hrev50780 by calling
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BListView::FrameResized() with the current Frame rectangle
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(though the FrameResized() method will additionally call
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BListItem::Update() for all items).
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\since BeOS R3
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*/
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/*!
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\fn void BListItem::SetWidth(float width)
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\brief Set the width of the list item to \a width.
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\param width The width to set the list item to.
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\since BeOS R3
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*/
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/*!
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\fn void BListItem::Update(BView* owner, const BFont* font)
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\brief Hook method that's called when the \a owner changes.
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This method gets called when the list item is added to the list view.
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The default implementation sets the width of the list item to the width of
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\a owner and sets the height to fit \a font.
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\param owner The list item's new \a owner.
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\param font The font set to the list item's current \a owner.
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\since BeOS R3
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*/
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/*!
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\fn status_t BListItem::Perform(perform_code d, void* arg)
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\brief Performs an action give a perform_code and arg. (Internal Method)
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\param d The perform code.
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\param arg A pointer to some data to perform on.
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\return A status code.
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\since Haiku R1
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*/
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/*!
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\fn void BListItem::SetExpanded(bool expanded)
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\brief Set the expanded state of the list item. This only makes sense if the
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list item is part of a BOutlineListView.
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\param expanded \c true to expand the list item, \c false to un-expand the
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list item.
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\since BeOS R3
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*/
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/*!
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\fn bool BListItem::IsExpanded() const
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\brief Returns whether or not the list item is currently expanded.
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\return \c true if the list item is expanded, \c false if it is not expanded.
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\since BeOS R3
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*/
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/*!
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\fn uint32 BListItem::OutlineLevel() const
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\brief Returns the current outline level of the list item. This only makes
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sense if the list item is part of a BOutlineListView.
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\return The current outline level of the list item.
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\since BeOS R3
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*/
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/*!
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\fn void BListItem::SetOutlineLevel(uint32 level)
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\brief Set the outline level of the list item.
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\param level The outline level to set the list item to.
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\since BeOS R3
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*/
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