EzUI/sources/ComboBox.cpp

#include "ComboBox.h"

namespace ezui {
	Control* ComboBox::Add(Control* childCtl)
	{
		return __super::Add(childCtl);
	}
	void ComboBox::Remove(Control* childCtl, bool freeCtrl)
	{
		__super::Remove(childCtl, freeCtrl);
	}
	void ComboBox::Init()
	{
		this->m_textBox.SetReadOnly(true);
		this->Add(&m_textBox);
		this->Add(&m_UpDown);

		m_UpDown.EventHandler = [&](Control* sd, EventArgs& arg)->void {
			if (arg.EventType == Event::OnPaint) {
				//绘制
				auto& args = (PaintEventArgs&)arg;

				auto fSzie = sd->GetFontSize() * 0.5f;
				int width = fSzie * 1.5f;

				Rect rect(0, 0, width, fSzie);
				rect.Y = (sd->Height() - fSzie) / 2.0f;
				rect.X += (sd->Height() - width) / 2.0f;

				//args.Graphics.SetColor(Color::Red);
				//args.Graphics.DrawRectangle(rect);

				PointF p1(rect.GetLeft(), rect.Y);
				PointF p2(rect.GetRight(), rect.Y);
				PointF p3(rect.GetLeft() + width / 2.0f, rect.GetBottom());

				args.Graphics.SetColor(this->GetForeColor());
				args.Graphics.DrawLine(p1, p3);
				args.Graphics.DrawLine(p2, p3);
			}
			else if (arg.EventType == Event::OnMouseDown/*&& args.Button == MouseButton::Left*/) {
				//单击
				if (m_menuWnd == NULL) {
					m_menuWnd = new MenuContent(this, &m_UpDown);
					m_menuWnd->SetShadow(10);
					m_list.Style.BackColor = Color::White;
					m_menuWnd->SetLayout(&m_list);
				}
				for (auto& it : m_list.GetControls()) {
					it->SetFixedHeight(Height());
				}
				int height = this->Height() * m_list.GetControls().size();
				if (height == 0) {
					height = Height();
				}
				if (!m_menuWnd->IsVisible()) {
					m_menuWnd->SetSize({ Width(), height });
					m_menuWnd->Show();
				}
				else {
					m_menuWnd->Hide();
				}
			}
			};
	}
	ComboBox::ComboBox(Object* parentObject) :HLayout(parentObject)
	{
		Init();
	}
	UIString ComboBox::GetText()
	{
		return this->m_textBox.GetText();
	}
	int ComboBox::GetCheck()
	{
		return this->m_index;
	}
	bool ComboBox::SetCheck(int pos)
	{
		auto item = m_list.GetControl(pos);
		if (item) {
			m_textBox.SetText(((Label*)item)->GetText());
			m_index = pos;
			return true;
		}
		return false;
	}

	ComboBox::~ComboBox()
	{
		m_list.Clear(true);
		if (m_menuWnd) {
			delete m_menuWnd;
		}
	}
	int ComboBox::AddItem(const UIString& text)
	{
		Label* lb = new Label;
		lb->SetDockStyle(DockStyle::Horizontal);
		lb->SetText(text);
		m_list.Add(lb);
		lb->HoverStyle.BackColor = Color::Gray;
		lb->HoverStyle.ForeColor = Color::White;

		lb->EventHandler = [&](Control* sd, const EventArgs& args) ->void {
			if (args.EventType == Event::OnMouseDown) {
				m_index = sd->Parent->IndexOf(sd);
				m_textBox.SetText(((Label*)sd)->GetText());
				m_textBox.Invalidate();
				m_menuWnd->Hide();
			}
			};

		int newIndex = m_list.GetControls().size() - 1;
		// 检查是否有待设置的索引
		if (m_pendingIndex >= 0 && m_pendingIndex == newIndex) {
			SetCheck(m_pendingIndex);
			m_pendingIndex = -1;  // 清除待设置标志
		}
		return newIndex;
	}
	void ComboBox::RemoveItem(int index)
	{
		Control* lb = m_list.GetControl(index);
		m_list.Remove(lb, true);
	}
	void ComboBox::SetAttribute(const UIString& key, const UIString& value)
	{
		do
		{
			if (key == "item") {
				// 添加下拉选项，支持多个选项用逗号分隔
				if (value.find(',') != UIString::npos) {
					// 解析多个选项
					size_t start = 0;
					size_t end = value.find(',');
					while (end != UIString::npos) {
						UIString item = value.substr(start, end - start);
						// 去除首尾空格
						while (!item.empty() && (item[0] == ' ' || item[0] == '\t')) {
							item = item.substr(1);
						}
						while (!item.empty() && (item[item.length() - 1] == ' ' || item[item.length() - 1] == '\t')) {
							item = item.substr(0, item.length() - 1);
						}
						if (!item.empty()) {
							AddItem(item);
						}
						start = end + 1;
						end = value.find(',', start);
					}
					// 处理最后一个选项
					UIString item = value.substr(start);
					while (!item.empty() && (item[0] == ' ' || item[0] == '\t')) {
						item = item.substr(1);
					}
					while (!item.empty() && (item[item.length() - 1] == ' ' || item[item.length() - 1] == '\t')) {
						item = item.substr(0, item.length() - 1);
					}
					if (!item.empty()) {
						AddItem(item);
					}
				}
				else {
					// 单个选项
					AddItem(value);
				}
				break;
			}
			if (key == "checked" || key == "selected" || key == "index") {
				// 设置选中的下标
			int index = std::atoi(value.c_str());
				if (!SetCheck(index)) {
					// 如果设置失败（可能是因为还没有添加item），保存索引稍后设置
					m_pendingIndex = index;
				}
				break;
			}
			if (key == "readonly") {
				// 设置文本框只读状态
				if (value == "true") {
					m_textBox.SetReadOnly(true);
					break;
				}
				if (value == "false") {
					m_textBox.SetReadOnly(false);
					break;
				}
			}
		} while (false);
		__super::SetAttribute(key, value);
	}
	void ComboBox::OnLayout() {
		this->m_UpDown.SetFixedSize(Size(Height(), Height()));
		__super::OnLayout();
	}

	ComboBox::MenuContent::MenuContent(Control* ownerCtl, Control* hittestCtl) :PopupWindow(0, 0, ownerCtl), m_hittestCtl(hittestCtl)
	{
	}
	void ComboBox::MenuContent::OnKillFocus(HWND wnd)
	{
		if (::GetWindow(Hwnd(), GW_OWNER) == wnd) {
			POINT pt;
			::GetCursorPos(&pt);
			// 将鼠标屏幕坐标转换为客户端坐标
			::ScreenToClient(::GetWindow(Hwnd(), GW_OWNER), &pt);
			Rect _hittestRect = m_hittestCtl->GetClientRect();
			if (_hittestRect.Contains(pt.x, pt.y)) {
				return;
			}
			else {
				this->Hide();
			}
		}
		else {
			this->Hide();
		}
	}
	ComboBox::MenuContent::~MenuContent()
	{
	}
}