Move windows to uptr. Add simple text editing.

src/ui_elements/widgets/TextBox.cpp

@@ -0,0 +1,97 @@
+#include "TextBox.h"
+#include "TextElement.h"
+#include <string>
+#include <sstream>
+
+TextBox::TextBox()
+    : Widget(),
+      mContent(),
+      mCaps(false)
+{
+    mBackgroundColor = Color::Create(200, 200, 200);
+}
+
+std::unique_ptr<TextBox> TextBox::Create()
+{
+    return std::make_unique<TextBox>();
+}
+
+void TextBox::SetContent(const std::string& text)
+{
+    mContent = text;
+}
+
+std::string TextBox::GetContent() const
+{
+    return mContent;
+}
+
+void TextBox::AppendContent(const std::string& text)
+{
+    mContent += text;
+}
+
+bool TextBox::OnMyKeyboardEvent(const KeyboardEvent* event)
+{
+    if(!event) return false;
+
+    const auto keyString = event->GetKeyString();
+    if (keyString == "KEY_RETURN")
+    {
+        AppendContent("\n");
+    }
+    else if (keyString == "KEY_BACK")
+    {
+        mContent = mContent.substr(0, mContent.size()-1);
+    }
+    else if (keyString == "KEY_SPACE")
+    {
+        AppendContent(" ");
+    }
+    else if (keyString == "KEY_CAPS")
+    {
+        mCaps = !mCaps;
+    }
+    else
+    {
+        if (mCaps && !keyString.empty())
+        {
+            const char c = std::toupper(keyString[0]);
+            AppendContent(std::string(&c));
+        }
+        else
+        {
+            AppendContent(keyString);
+        }
+    }
+
+    return true;
+}
+
+void TextBox::OnPaintEvent(const PaintEvent* event)
+{
+    mMyLayers.clear();
+    AddBackground(event);
+
+    double offset = 0;
+    if(!mContent.empty())
+    {
+        std::stringstream stream(mContent);
+        std::string segment;
+        std::vector<std::string> seglist;
+        while(std::getline(stream, segment, '\n'))
+        {
+           seglist.push_back(segment);
+        }
+        for(const auto& line : seglist)
+        {
+            auto loc = DiscretePoint(mLocation.GetX() + mWidth/10,
+                    mLocation.GetY() + mHeight/10 + offset);
+            auto textLayer = VisualLayer::Create();
+            textLayer->SetText(TextElement::Create(line, loc));
+            mMyLayers.push_back(std::move(textLayer));
+            offset += 15;
+        }
+    }
+    CopyMyLayers();
+}