comboctrl.tex

很牛的GUI源码wxWidgets-2.8.0.zip 可在多种平台下运行.

Returns features supported by wxComboCtrl. If needed feature is missing,
you need to instead use wxGenericComboCtrl, which however may lack
native look and feel (but otherwise sports identical API).

\wxheading{Return value}

Value returned is a combination of following flags:

\twocolwidtha{8cm}%
\begin{twocollist}\itemsep=0pt
\twocolitem{{\tt wxComboCtrlFeatures::MovableButton}}{Button can
be on either side of the control.}
\twocolitem{{\tt wxComboCtrlFeatures::BitmapButton}}{Button may
be replaced with bitmap.}
\twocolitem{{\tt wxComboCtrlFeatures::ButtonSpacing}}{Button can
have spacing.}
\twocolitem{{\tt wxComboCtrlFeatures::TextIndent}}{SetTextIndent
works.}
\twocolitem{{\tt wxComboCtrlFeatures::PaintControl}}{Combo control
itself can be custom painted.}
\twocolitem{{\tt wxComboCtrlFeatures::PaintWritable}}{A variable-
width area in front of writable combo control's textctrl can
be custom painted.}
\twocolitem{{\tt wxComboCtrlFeatures::Borderless}}{wxNO\_BORDER
window style works.}
\twocolitem{{\tt wxComboCtrlFeatures::All}}{All of the
above.}
\end{twocollist}


\membersection{wxComboCtrl::GetInsertionPoint}\label{wxcomboctrlgetinsertionpoint}

\constfunc{long}{GetInsertionPoint}{\void}

Returns the insertion point for the combo control's text field.

\textbf{Note:} Under wxMSW, this function always returns $0$ if the combo control
doesn't have the focus.


\membersection{wxComboCtrl::IsPopupWindowState}\label{wxcomboctrlispopupwindowstate}

\constfunc{bool}{IsPopupWindowState}{\param{int }{state}}

Returns \true if the popup window is in the given state.
Possible values are:
\twocolwidtha{8cm}%
\begin{twocollist}\itemsep=0pt
\twocolitem{{\tt wxComboCtrl::Hidden}}{Popup window is hidden.}
\twocolitem{{\tt wxComboCtrl::Animating}}{Popup window is being shown, but the
popup animation has not yet finished.}
\twocolitem{{\tt wxComboCtrl::Visible}}{Popup window is fully visible.}
\end{twocollist}



\membersection{wxComboCtrl::GetLastPosition}\label{wxcomboctrlgetlastposition}

\constfunc{long}{GetLastPosition}{\void}

Returns the last position in the combo control text field.


\membersection{wxComboCtrl::GetPopupControl}\label{wxcomboctrlgetpopupcontrol}

\func{wxComboPopup*}{GetPopupControl}{\void}

Returns current popup interface that has been set with SetPopupControl.


\membersection{wxComboCtrl::GetPopupWindow}\label{wxcomboctrlgetpopupwindow}

\constfunc{wxWindow*}{GetPopupWindow}{\void}

Returns popup window containing the popup control.


\membersection{wxComboCtrl::GetTextCtrl}\label{wxcomboctrlgettextctrl}

\constfunc{wxTextCtrl*}{GetTextCtrl}{\void}

Get the text control which is part of the combo control.


\membersection{wxComboCtrl::GetTextIndent}\label{wxcomboctrlgettextindent}

\constfunc{wxCoord}{GetTextIndent}{\void}

Returns actual indentation in pixels.


\membersection{wxComboCtrl::GetTextRect}\label{wxcomboctrlgettextrect}

\constfunc{const wxRect\&}{GetTextRect}{\void}

Returns area covered by the text field (includes everything except
borders and the dropdown button).


\membersection{wxComboCtrl::GetValue}\label{wxcomboctrlgetvalue}

\constfunc{wxString}{GetValue}{\void}

Returns text representation of the current value. For writable
combo control it always returns the value in the text field.


\membersection{wxComboCtrl::HidePopup}\label{wxcomboctrlhidepopup}

\func{void}{HidePopup}{\void}

Dismisses the popup window.


\membersection{wxComboCtrl::IsPopupShown}\label{wxcomboctrlispopupshown}

\constfunc{bool}{IsPopupShown}{\void}

Returns \true if the popup is currently shown


\membersection{wxComboCtrl::OnButtonClick}\label{wxcomboctrlonbuttonclick}

\func{void}{OnButtonClick}{\void}

Implement in a derived class to define what happens on
dropdown button click.

Default action is to show the popup.

\textbf{Note:} If you implement this to do something else than
show the popup, you must then also implement
\helpref{DoSetPopupControl}{wxcomboctrldosetpopupcontrol} to always
return NULL.


\membersection{wxComboCtrl::Paste}\label{wxcomboctrlpaste}

\func{void}{Paste}{\void}

Pastes text from the clipboard to the text field.


\membersection{wxComboCtrl::Remove}\label{wxcomboctrlremove}

\func{void}{Remove}{\param{long }{from}, \param{long }{to}}

Removes the text between the two positions in the combo control text field.

\wxheading{Parameters}

\docparam{from}{The first position.}

\docparam{to}{The last position.}


\membersection{wxComboCtrl::Replace}\label{wxcomboctrlreplace}

\func{void}{Replace}{\param{long }{from}, \param{long }{to}, \param{const wxString\& }{value}}

Replaces the text between two positions with the given text, in the combo control text field.

\wxheading{Parameters}

\docparam{from}{The first position.}

\docparam{to}{The second position.}

\docparam{text}{The text to insert.}


\membersection{wxComboCtrl::SetButtonBitmaps}\label{wxcomboctrlsetbuttonbitmaps}

\func{void}{SetButtonBitmaps}{\param{const wxBitmap\& }{bmpNormal}, \param{bool }{pushButtonBg = false}, \param{const wxBitmap\& }{bmpPressed = wxNullBitmap}, \param{const wxBitmap\& }{bmpHover = wxNullBitmap}, \param{const wxBitmap\& }{bmpDisabled = wxNullBitmap}}

Sets custom dropdown button graphics.

\wxheading{Parameters}

\docparam{bmpNormal}{Default button image.}
\docparam{pushButtonBg}{If \true, blank push button background is painted
below the image.}
\docparam{bmpPressed}{Depressed button image.}
\docparam{bmpHover}{Button image when mouse hovers above it. This
should be ignored on platforms and themes that do not generally draw
different kind of button on mouse hover.}
\docparam{bmpDisabled}{Disabled button image.}


\membersection{wxComboCtrl::SetButtonPosition}\label{wxcomboctrlsetbuttonposition}

\func{void}{SetButtonPosition}{\param{int }{width = -1}, \param{int }{height = -1}, \param{int }{side = wxRIGHT}, \param{int }{spacingX = 0}}

Sets size and position of dropdown button.

\wxheading{Parameters}

\docparam{width}{Button width. Value <= $0$ specifies default.}
\docparam{height}{Button height. Value <= $0$ specifies default.}
\docparam{side}{Indicates which side the button will be placed.
Value can be {\tt wxLEFT} or {\tt wxRIGHT}.}
\docparam{spacingX}{Horizontal spacing around the button. Default is $0$.}


\membersection{wxComboCtrl::SetCustomPaintWidth}\label{wxcomboctrlsetcustompaintwidth}

\func{void}{SetCustomPaintWidth}{\param{int }{width}}

Set width, in pixels, of custom painted area in control without {\tt wxCB\_READONLY}
style. In read-only \helpref{wxOwnerDrawnComboBox}{wxownerdrawncombobox}, this is used
to indicate area that is not covered by the focus rectangle.


\membersection{wxComboCtrl::SetInsertionPoint}\label{wxcomboctrlsetinsertionpoint}

\func{void}{SetInsertionPoint}{\param{long }{pos}}

Sets the insertion point in the text field.

\wxheading{Parameters}

\docparam{pos}{The new insertion point.}


\membersection{wxComboCtrl::SetInsertionPointEnd}\label{wxcomboctrlsetinsertionpointend}

\func{void}{SetInsertionPointEnd}{\void}

Sets the insertion point at the end of the combo control text field.


\membersection{wxComboCtrl::SetPopupAnchor}\label{wxcomboctrlsetpopupanchor}

\func{void}{SetPopupAnchor}{\param{int }{anchorSide}}

Set side of the control to which the popup will align itself. Valid values are
{\tt wxLEFT}, {\tt wxRIGHT} and $0$. The default value $0$ means that the most appropriate
side is used (which, currently, is always {\tt wxLEFT}).


\membersection{wxComboCtrl::SetPopupControl}\label{wxcomboctrlsetpopupcontrol}

\func{void}{SetPopupControl}{\param{wxComboPopup* }{popup}}

Set popup interface class derived from wxComboPopup.
This method should be called as soon as possible after the control
has been created, unless \helpref{OnButtonClick}{wxcomboctrlonbuttonclick}
has been overridden.


\membersection{wxComboCtrl::SetPopupExtents}\label{wxcomboctrlsetpopupextents}

\func{void}{SetPopupExtents}{\param{int }{extLeft}, \param{int }{extRight}}

Extends popup size horizontally, relative to the edges of the combo control.

\wxheading{Parameters}

\docparam{extLeft}{How many pixel to extend beyond the left edge of the
control. Default is $0$.}
\docparam{extRight}{How many pixel to extend beyond the right edge of the
control. Default is $0$.}

\wxheading{Remarks}

Popup minimum width may override arguments.

It is up to the popup to fully take this into account.


\membersection{wxComboCtrl::SetPopupMaxHeight}\label{wxcomboctrlsetpopupmaxheight}

\func{void}{SetPopupMaxHeight}{\param{int }{height}}

Sets preferred maximum height of the popup.

\wxheading{Remarks}

Value -1 indicates the default.

Also, popup implementation may choose to ignore this.


\membersection{wxComboCtrl::SetPopupMinWidth}\label{wxcomboctrlsetpopupminwidth}

\func{void}{SetPopupMinWidth}{\param{int }{width}}

Sets minimum width of the popup. If wider than combo control, it will extend to the left.

\wxheading{Remarks}

Value -1 indicates the default.

Also, popup implementation may choose to ignore this.


\membersection{wxComboCtrl::SetSelection}\label{wxcomboctrlsetselection}

\func{void}{SetSelection}{\param{long }{from}, \param{long }{to}}

Selects the text between the two positions, in the combo control text field.

\wxheading{Parameters}

\docparam{from}{The first position.}

\docparam{to}{The second position.}


\membersection{wxComboCtrl::SetText}\label{wxcomboctrlsettext}

\func{void}{SetText}{\param{const wxString\& }{value}}

Sets the text for the text field without affecting the
popup. Thus, unlike \helpref{SetValue}{wxcomboctrlsetvalue}, it works
equally well with combo control using {\tt wxCB\_READONLY} style.


\membersection{wxComboCtrl::SetTextIndent}\label{wxcomboctrlsettextindent}

\func{void}{SetTextIndent}{\param{int }{indent}}

This will set the space in pixels between left edge of the control and the
text, regardless whether control is read-only or not. Value -1 can be
given to indicate platform default.


\membersection{wxComboCtrl::SetValue}\label{wxcomboctrlsetvalue}

\func{void}{SetValue}{\param{const wxString\& }{value}}

Sets the text for the combo control text field.

{\bf NB:} For a combo control with {\tt wxCB\_READONLY} style the
string must be accepted by the popup (for instance, exist in the dropdown
list), otherwise the call to SetValue() is ignored


\membersection{wxComboCtrl::SetValueWithEvent}\label{wxcomboctrlsetvaluewithevent}

\func{void}{SetValueWithEvent}{\param{const wxString\& }{value}, \param{bool }{withEvent = true}}

Same as SetValue, but also sends wxCommandEvent of type wxEVT\_COMMAND\_TEXT\_UPDATED
if {\tt withEvent} is \true.


\membersection{wxComboCtrl::ShowPopup}\label{wxcomboctrlshowpopup}

\func{void}{ShowPopup}{\void}

Show the popup.


\membersection{wxComboCtrl::Undo}\label{wxcomboctrlundo}

\func{void}{Undo}{\void}

Undoes the last edit in the text field. Windows only.


\membersection{wxComboCtrl::UseAltPopupWindow}\label{wxcomboctrlusealtpopupwindow}

\func{void}{UseAltPopupWindow}{\param{bool }{enable = true}}

Enable or disable usage of an alternative popup window, which guarantees
ability to focus the popup control, and allows common native controls to
function normally. This alternative popup window is usually a wxDialog,
and as such, when it is shown, its parent top-level window will appear
as if the focus has been lost from it.