67 lines
1.9 KiB
Plaintext
67 lines
1.9 KiB
Plaintext
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//+------------------------------------------------------------------+
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//| ComboBoxResizable.mqh |
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//| Copyright (c) 2019, Marketeer |
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//| https://www.mql5.com/en/users/marketeer |
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//+------------------------------------------------------------------+
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#include <Controls/ComboBox.mqh>
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class ComboBoxResizable: public CComboBox
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{
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public:
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virtual bool OnEvent(const int id, const long &lparam, const double &dparam, const string &sparam) override;
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virtual bool OnResize(void) override
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{
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m_edit.Width(Width());
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int x1 = Width() - (CONTROLS_BUTTON_SIZE + CONTROLS_COMBO_BUTTON_X_OFF);
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int y1 = (Height() - CONTROLS_BUTTON_SIZE) / 2;
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m_drop.Move(Left() + x1, Top() + y1);
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m_list.Width(Width());
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return CWndContainer::OnResize();
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}
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virtual bool OnClickButton(void) override
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{
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// this is a hack to trigger resizing of elements in the list
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// we need it because standard ListView is incorrectly coded in such a way
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// that elements are resized only if vscroll is present
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bool vs = m_list.VScrolled();
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if(m_drop.Pressed())
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{
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m_list.VScrolled(true);
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}
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bool b = CComboBox::OnClickButton();
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m_list.VScrolled(vs);
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return b;
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}
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virtual bool Enable(void) override
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{
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m_edit.Show();
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m_drop.Show();
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return CComboBox::Enable();
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}
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virtual bool Disable(void) override
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{
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m_edit.Hide();
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m_drop.Hide();
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return CComboBox::Disable();
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}
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};
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#define EXIT_ON_DISABLED \
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if(!IsEnabled()) \
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{ \
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return false; \
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}
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EVENT_MAP_BEGIN(ComboBoxResizable)
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EXIT_ON_DISABLED
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ON_EVENT(ON_CLICK, m_drop, OnClickButton)
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EVENT_MAP_END(CComboBox)
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