详细描述. QTable类提供了一个灵活的和可编辑的表格部件。 鉴于所提供功能的复杂性，QTable确实包含了许多API，尽管如此，它还是易于使用的。. Detailed Description. The QLineEdit widget is a one-line text editor. A line edit allows the user to enter and edit a single line of plain text with a useful collection of editing functions, including undo and redo, cut and paste, and drag and drop. TOC | >> Lists, Trees and Tables. Most applications tend to show data in the form of lists, tables and trees. This need is met by Qt throught a number of classes ranging from simple text-lists to .
The appearance of the graph is mainly determined by the line style, scatter style, brush and pen of the graph setLineStyle , setScatterStyle , setBrush , setPen. Depending on the current setting of setOpenGl , and the current Qt version, different backends subclasses of QCPAbstractPaintBuffer are created, initialized with the proper size and device pixel ratio, and returned. At runtime, I get "No such Signal" errors. If the doubleclick event is delivered to a different item than the one that received the first press and release, it will be delivered as a press event. If you would like to save your changes when resetting the view, you can reimplement this function, commit your changes, and then call the superclass' implementation.
QLineEdit Class Reference
Usually you create new graphs by calling QCustomPlot:: The resulting instance can be accessed via QCustomPlot:: To plot data, assign it with the setData or addData functions. Alternatively, you can also access and modify the data via the data method, which returns a pointer to the internal QCPGraphDataContainer.
Graphs are used to display single-valued data. Single-valued means that there should only be one data point per unique key coordinate. In other words, the graph can't have loops. If you do want to plot non-single-valued curves, rather use the QCPCurve plottable. The appearance of the graph is mainly determined by the line style, scatter style, brush and pen of the graph setLineStyle , setScatterStyle , setBrush , setPen.
QCPGraph knows two types of fills: Normal graph fills towards the zero-value-line parallel to the key axis of the graph, and fills between two graphs, called channel fills. To enable a fill, just set a brush with setBrush which is neither Qt:: NoBrush nor fully transparent. By default, a normal fill towards the zero-value-line will be drawn. To set up a channel fill between this graph and another one, call setChannelFillGraph with the other graph as parameter.
Defines how the graph's line is represented visually in the plot. The line is drawn with the current pen of the graph setPen. Constructs a graph which uses keyAxis as its key axis "x" and valueAxis as its value axis "y". If either of these restrictions is violated, a corresponding message is printed to the debug output qDebug , the construction is not aborted, though.
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The QAbstractItemView class provides the basic functionality for item view classes. QAbstractItemView is an abstract class and cannot itself be instantiated. It provides a standard interface for interoperating with models through the signals and slots mechanism, enabling subclasses to be kept up-to-date with changes to their models. This class provides standard support for keyboard and mouse navigation, viewport scrolling, item editing, and selections. The keyboard navigation implements this functionality:.
Note that the above table assumes that the selection mode allows the operations. For instance, you cannot select items if the selection mode is QAbstractItemView:: The view classes that inherit QAbstractItemView only need to implement their own view-specific functionality, such as drawing items, returning the geometry of items, finding items, etc.
The root item is returned by rootIndex , and the current item by currentIndex. To make sure that an item is visible use scrollTo. To set the range of the scroll bars, you can, for example, reimplement the view's resizeEvent function:. Several other functions are concerned with selection control; for example setSelectionMode , and setSelectionBehavior.
This class provides a default selection model to work with selectionModel , but this can be replaced by using setSelectionModel with an instance of QItemSelectionModel. For complete control over the display and editing of items you can specify a delegate with setItemDelegate. QAbstractItemView provides a lot of protected functions. Some are concerned with editing, for example, edit , and commitData , whilst others are keyboard and mouse event handlers.
Describes the various drag and drop events the view can act upon. By default the view does not support dragging or dropping NoDragDrop. See also setDragDropMode and Using drag and drop with item views. This enum indicates the position of the drop indicator in relation to the index at the current mouse position:. It stores an OR combination of EditTrigger values. Describes how the scrollbar should behave. When setting the scroll mode to ScrollPerPixel the single step size will adjust automatically unless it was set explicitly using setSingleStep.
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