wxwidgets - (推+下拉)按钮wxWidgets

Question

我需要一个具有普通按钮和下拉按钮的控件。

例如

类似的控件在 wxRibbonButtonBar 中可用，我无法在简单的 wxPanel 中使用它。

Answer 1

我实现了 SplitButton，它看起来像:

SplitButton.h

#ifndef __SPLIT_BUTTON_H__
#define __SPLIT_BUTTON_H__

#include <wx/wx.h>
#include <wx/menu.h>

class SplitButton : public wxPanel
{
public:
    SplitButton(wxWindow *parent,
        wxWindowID id,
        const wxString& label,
        const wxPoint& pos = wxDefaultPosition,
        const wxSize& size = wxDefaultSize);

    ~SplitButton();

    wxMenu* GetSplitButtonMenu();

protected:
    void OnKillFocus(wxFocusEvent& event);
    void OnMouseLeave(wxMouseEvent& event);
    void OnMouseEnter(wxMouseEvent& event);
    void OnLeftButtonUp(wxMouseEvent& event);
    void OnLeftButtonDown(wxMouseEvent& event);
    void OnPaint(wxPaintEvent& WXUNUSED(event));

    bool Enable(bool enable = true) override;

private:
    int m_stateButton = 0;
    int m_stateMenu = 0;
    bool m_bIsEnable = true;
    wxColor m_colorNormal;
    wxColor m_colorDisabled;
    const int m_arrowButtonWidth = 20;
    bool m_bLButtonDown = false;
    wxString m_label;
    wxMenu* m_pMenu = nullptr;
};

#endif /*__SPLIT_BUTTON_H__*/

SplitButton.cpp

#include "SplitButton.h"
#include <wx/renderer.h>

SplitButton::SplitButton(wxWindow *parent,
    wxWindowID id,
    const wxString& label,
    const wxPoint& pos,
    const wxSize& size)
    : wxPanel(parent, id, pos, size, wxBORDER_NONE | wxTAB_TRAVERSAL, "DropDownButton"),
    m_label(label)
{
    m_colorNormal = GetForegroundColour();
    m_colorDisabled = GetForegroundColour().MakeDisabled();

    if (size == wxDefaultSize)
    {
        wxSize defaultSize = wxButton::GetDefaultSize();

        wxSize textSize = GetTextExtent(m_label);
        textSize.SetWidth(textSize.GetWidth() + m_arrowButtonWidth + 20);
        SetMinSize(wxSize(textSize.GetWidth(), defaultSize.GetHeight()));
    }

    Bind(wxEVT_PAINT, &SplitButton::OnPaint, this);
    Bind(wxEVT_LEFT_UP, &SplitButton::OnLeftButtonUp, this);
    Bind(wxEVT_LEFT_DOWN, &SplitButton::OnLeftButtonDown, this);
    Bind(wxEVT_KILL_FOCUS, &SplitButton::OnKillFocus, this);
    Bind(wxEVT_LEAVE_WINDOW, &SplitButton::OnMouseLeave, this);
    Bind(wxEVT_ENTER_WINDOW, &SplitButton::OnMouseEnter, this);

    m_pMenu = new wxMenu();
}

SplitButton::~SplitButton()
{
    delete m_pMenu;
    m_pMenu = nullptr;
}

wxMenu* SplitButton::GetSplitButtonMenu()
{
    return m_pMenu;
}

void SplitButton::OnKillFocus(wxFocusEvent& event)
{
    m_stateButton = wxCONTROL_CURRENT;
    m_stateMenu = wxCONTROL_CURRENT;
    Refresh();

    event.Skip();
}

void SplitButton::OnMouseLeave(wxMouseEvent& event)
{
    m_stateButton = 0;
    m_stateMenu = 0;
    Refresh();

    event.Skip();
}

void SplitButton::OnMouseEnter(wxMouseEvent& event)
{
    m_stateButton = wxCONTROL_CURRENT;
    m_stateMenu = wxCONTROL_CURRENT;
    Refresh();

    event.Skip();
}

void SplitButton::OnLeftButtonUp(wxMouseEvent& event)
{
    m_stateButton = 0;
    m_stateMenu = 0;

    Refresh();

    int x = -1;
    int y = -1;
    event.GetPosition(&x, &y);

    if (x < (GetSize().GetWidth() - m_arrowButtonWidth))
    {
        wxEvtHandler* pEventHandler = GetEventHandler();
        wxASSERT(pEventHandler);

        pEventHandler->CallAfter([=]()
        {
            wxCommandEvent evt(wxEVT_BUTTON, this->GetId());
            evt.SetEventObject(this);
            GetEventHandler()->ProcessEvent(evt);
        });
    }

    m_bLButtonDown = false;

    event.Skip();
}

void SplitButton::OnLeftButtonDown(wxMouseEvent& event)
{
    m_bLButtonDown = true;

    int x = -1;
    int y = -1;
    event.GetPosition(&x, &y);

    if (x >= (GetSize().GetWidth() - m_arrowButtonWidth))
    {
        m_stateButton = 0;
        m_stateMenu = wxCONTROL_PRESSED;
        Refresh();

        wxSize size = GetSize();
        wxPoint position;
        position.x = 0;
        position.y = size.GetHeight();
        PopupMenu(m_pMenu, position);

        m_stateMenu = 0;
        Refresh();
    }
    else
    {
        m_stateButton = wxCONTROL_PRESSED;
        m_stateMenu = wxCONTROL_PRESSED;
        Refresh();
    }

    event.Skip();
}

void SplitButton::OnPaint(wxPaintEvent& WXUNUSED(event))
{
    wxPaintDC dc(this);
    wxSize size = GetSize();
    const int width = size.GetWidth() - m_arrowButtonWidth;

    // Draw first part of button
    wxRect r1;
    r1.x = 0;
    r1.y = 0;
    r1.width = width + 2;
    r1.height = size.GetHeight();

    wxRendererNative::Get().DrawPushButton(this, dc, r1, m_stateButton);

    SetForegroundColour(m_bIsEnable ? m_colorNormal : m_colorDisabled);

    r1.y += (size.GetHeight() - GetCharHeight()) / 2;
    dc.DrawLabel(m_label, r1, wxALIGN_CENTER_HORIZONTAL);

    // Draw second part of button
    wxRect r2;
    r2.x = width - 2;
    r2.y = 0;
    r2.width = m_arrowButtonWidth;
    r2.height = size.GetHeight();

    wxRendererNative::Get().DrawPushButton(this, dc, r2, m_stateMenu);
    wxRendererNative::Get().DrawDropArrow(this, dc, r2, m_stateMenu);
}

bool SplitButton::Enable(bool enable)
{
    m_bIsEnable = enable;
    wxPanel::Enable(m_bIsEnable);

    if (m_bIsEnable)
    {
        m_stateButton = 0;
        m_stateMenu = 0;
    }
    else
    {
        m_stateButton = wxCONTROL_DISABLED;
        m_stateMenu = wxCONTROL_DISABLED;
    }

    wxPaintEvent event;
    ProcessEvent(event);
    Refresh();

    return enable;
}