52、wxWidgets之自定义wxCombox的弹出窗口-wxListView

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最新推荐文章于 2023-09-04 00:53:48 发布

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分类专栏： wxWidgets自学笔记文章标签：小程序

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本文介绍了如何使用C++和wxWidgets库创建一个自定义的wxListViewComboPopup类，该类结合了wxListView和wxComboPopup的功能。这个控件允许用户在下拉列表中选择项，并提供了添加列、设置和获取选中值等功能。通过设置列宽和响应鼠标事件，实现了列表的交互性。示例代码展示了如何创建和使用这个自定义组件。

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#include <wx/wx.h>
#include <wx/combo.h>
#include <wx/listctrl.h>
class wxListViewComboPopup : public wxListView, public wxComboPopup
{
public:
virtual wxListView* GetListView();

// Initialize member variables
virtual void Init();
// Create popup control
virtual bool Create(wxWindow* parent);

// Return pointer to the created control
virtual wxWindow* GetControl();
// Translate string into a list selection
virtual void SetStringValue(const wxString& s);
// Get list selection as a string
virtual wxString GetStringValue() const;
// Do mouse hot-tracking (which is typical in list popups)

long AppendColumn(wxString& columnName,int nWidth);

void OnMouseMove(wxMouseEvent& event);
// On mouse left up, set the value and close the popup
// void OnMouseClick(wxListEvent& WXUNUSED(event));
void OnSelected(wxListEvent& event);
protected:
wxWindow* m_parent;

long m_value; // current item index

wxListView* lv;

private:
// wxDECLARE_EVENT_TABLE();
};

wxListView* wxListViewComboPopup::GetListView()
{
return lv;
}

// Initialize member variables
void wxListViewComboPopup::Init()
{
m_value = -1;
}
// Create popup control
bool wxListViewComboPopup::Create(wxWindow* parent)
{
// return wxListView::Create(parent,1,wxPoint(0,0),wxDefaultSize,wxLC_LIST);

lv = new wxListView();
bool b = lv->Create(parent, 1, wxPoint(0, 0), wxDefaultSize, wxLC_HRULES | wxLC_REPORT | wxLC_VRULES);

lv->Bind(wxEVT_LIST_ITEM_SELECTED,wxListEventHandler( wxListViewComboPopup::OnSelected), this);

return b;

}

// Return pointer to the created control
wxWindow* wxListViewComboPopup::GetControl()
{
return lv;
}
// Translate string into a list selection
void wxListViewComboPopup::SetStringValue(const wxString& s)
{
int n = lv->FindItem(-1, s);
if ( n >= 0 && n < lv->GetItemCount()) lv->Select(n);

}
// Get list selection as a string
wxString wxListViewComboPopup::GetStringValue() const
{
long index = lv->GetFirstSelected();
if(index !=-1){
// return lv->GetItemText(index,0);//第一列的值
return lv->GetItemText(index,1);//第二列的值
}
return wxEmptyString;
}
// Do mouse hot-tracking (which is typical in list popups)
void wxListViewComboPopup::OnMouseMove(wxMouseEvent& event)
{
// TODO: Move selection to cursor
}
// On mouse left up, set the value and close the popup
void wxListViewComboPopup::OnSelected(wxListEvent& event)
{
m_value = lv->GetFirstSelected();

// TODO: Send event as well
Dismiss();//hide the window
}

long wxListViewComboPopup::AppendColumn(wxString& columnName,int nWidth = wxLIST_AUTOSIZE)
{
long index = lv->AppendColumn(columnName);
lv->SetColumnWidth(index,nWidth);

return index;
}

使用方法

wxComboCtrl* comboCtrl = new wxComboCtrl(this, wxID_ANY, wxEmptyString);
wxListViewComboPopup* popupCtrl = new wxListViewComboPopup();

// It is important to call SetPopupControl() as soon as possible
comboCtrl->SetPopupControl(popupCtrl);
auto* lv= popupCtrl->GetListView();
lv->AppendColumn(wxT("任务"),wxLIST_FORMAT_LEFT,wxLIST_AUTOSIZE);
lv->AppendColumn(wxT("名称"),wxLIST_FORMAT_LEFT,wxLIST_AUTOSIZE_USEHEADER);
lv->AppendColumn(wxT("名"),wxLIST_FORMAT_LEFT,wxLIST_AUTOSIZE);
lv->AppendColumn(wxT("称"),wxLIST_FORMAT_LEFT,wxLIST_AUTOSIZE);

wxListItem colID;
colID.SetId(0);//必须设置
colID.SetText(wxT("ID"));
colID.SetAlign(wxLIST_FORMAT_CENTER);

wxListItem colName;
colName.SetId(1);
colName.SetText(wxT("名称"));
colName.SetAlign(wxLIST_FORMAT_CENTER);
colName.SetData(1);

long index;
index = lv->InsertItem(colID);
lv->SetItem(index,1,wxT("名称1"));//此处设置的名称的图标
// wxMessageBox(wxString::Format("%d",index));

index = lv->InsertItem(colName);
lv->SetItem(index,1,wxT("名称2"));