diff --git a/SMILEBASIC/dialog.d b/SMILEBASIC/dialog.d
new file mode 100644
index 0000000..0fab6b0
--- /dev/null
+++ b/SMILEBASIC/dialog.d
@@ -0,0 +1,66 @@
+module otya.smilebasic.dialog;
+import otya.smilebasic.petitcomputer;
+import derelict.sdl2.sdl;
+import derelict.sdl2.image;
+import derelict.opengl3.gl;
+import derelict.opengl3.gl3;
+
+class DialogBase
+{
+    abstract void render();
+}
+
+enum SelectionType
+{
+    ok,
+    noYes,
+    backNext,
+    cancelConfirm,
+    cancelExecute,
+    next,
+}
+
+enum ButtonResult
+{
+    a = 128,
+    b = 129,
+    x = 130,
+    y = 131,
+    up = 132,
+    down = 133,
+    left = 134,
+    right = 135,
+    l = 136,
+    r = 137,
+    touch = 140,
+}
+
+
+class Dialog : DialogBase
+{
+    private PetitComputer petitcom;
+    this(PetitComputer petitcom)
+    {
+        this.petitcom = petitcom;
+    }
+    private int result;
+
+    override void render()
+    {
+        
+    }
+
+    int show(wstring text)
+    {
+        petitcom.dialog = this;
+        auto area = petitcom.showTouchScreen();
+        while (true)
+        {
+            auto to = petitcom.touchPosition();
+            
+        }
+        petitcom.hideTouchScreen();
+        return result;
+    }
+}
+
diff --git a/SMILEBASIC/petitcomputer.d b/SMILEBASIC/petitcomputer.d
index 3cd2e45..8e0c3a0 100644
--- a/SMILEBASIC/petitcomputer.d
+++ b/SMILEBASIC/petitcomputer.d
@@ -19,6 +19,7 @@ import otya.smilebasic.parser;
 import otya.smilebasic.project;
 import otya.smilebasic.console;
 import otya.smilebasic.graphic;
+import otya.smilebasic.dialog;
 const static rot_test_deg = 45f;
 const static rot_test_x = 0f;
 const static rot_test_y = 1f;
@@ -540,7 +541,12 @@ class PetitComputer
                 this.sprite.spclip;
             }
         }
+        updateWindowSize();
+    }
 
+    //do not call in synchronized(renderSync)
+    void updateWindowSize()
+    {
         SDL_SetWindowSize(window, cast(int)(currentDisplay.windowSize.width * scaleX), cast(int)(currentDisplay.windowSize.height * scaleY));
     }
 
@@ -813,6 +819,10 @@ class PetitComputer
                     glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
                     version(test) glLoadIdentity();
                     version(test) glRotatef(rot_test_deg, rot_test_x, rot_test_y, rot_test_z);
+                    if (dialog)
+                    {
+                        dialog.render();
+                    }
                     console.render();
 
                     graphic.render();
@@ -1607,6 +1617,30 @@ class PetitComputer
     wstring versionString = "3.5.0";
     int version_ = 0x3050000;
     wstring[5] functionKey;
+
+    DialogBase dialog;
+    SDL_Rect showTouchScreen()
+    {
+        if (currentDisplay.rect.length != 1)
+        {
+            return currentDisplay.rect[1];
+        }
+        auto rect = currentDisplay.rect[0];
+        rect.y += rect.h;
+        currentDisplay.windowSize.height += rect.h;
+        updateWindowSize();
+        return rect;
+    }
+    void hideTouchScreen()
+    {
+        if (currentDisplay.rect.length != 1)
+        {
+            return;
+        }
+        auto rect = currentDisplay.rect[0];
+        currentDisplay.windowSize.height -= rect.h;
+        updateWindowSize();
+    }
     //プチコン内部表現はRGB5_A1
     static uint toGLColor(GLenum format, ubyte r, ubyte g, ubyte b, ubyte a)
     {
diff --git a/dub.json b/dub.json
index 8730afb..cbc8708 100644
--- a/dub.json
+++ b/dub.json
@@ -4,7 +4,7 @@
 		"derelict-sdl2": "~>1.9.7",
 		"derelict-gl3": "*"
 	},
-	"sourceFiles": ["SMILEBASIC/bg.d","SMILEBASIC/builtinfunctions.d","SMILEBASIC/compiler.d","SMILEBASIC/error.d","SMILEBASIC/main.d","SMILEBASIC/node.d","SMILEBASIC/parser.d","SMILEBASIC/petitcomputer.d","SMILEBASIC/sprite.d","SMILEBASIC/systemvariable.d","SMILEBASIC/token.d","SMILEBASIC/type.d","SMILEBASIC/VM.d","SMILEBASIC/project.d","SMILEBASIC/console.d","SMILEBASIC/graphic.d"],
+	"sourceFiles": ["SMILEBASIC/bg.d","SMILEBASIC/builtinfunctions.d","SMILEBASIC/compiler.d","SMILEBASIC/error.d","SMILEBASIC/main.d","SMILEBASIC/node.d","SMILEBASIC/parser.d","SMILEBASIC/petitcomputer.d","SMILEBASIC/sprite.d","SMILEBASIC/systemvariable.d","SMILEBASIC/token.d","SMILEBASIC/type.d","SMILEBASIC/VM.d","SMILEBASIC/project.d","SMILEBASIC/console.d","SMILEBASIC/graphic.d","SMILEBASIC/dialog.d"],
 	"targetType": "executable",
 	"buildRequirements": ["allowWarnings"],
 	"targetPath": "out",