SUPERNOVA: Fixes too large edit() field

Before edit() cleared the input on screen by overdrawing it from x to
the right side of the screen. This works fine for terminals but for
example setting the watches alarm time it does not.
The text font is 5x8 so overdrawing the max input length + 1 * 5 is
sufficient to clear the screen from our input and the cursor. Also if
the value ends up being too big it is clamped to the right side
of the screen.

2 files changed, 5 insertions, 1 deletions

diff --git a/engines/supernova/msn_def.h b/engines/supernova/msn_def.h
index a8c76a49df..884b467350 100644
--- a/engines/supernova/msn_def.h
+++ b/engines/supernova/msn_def.h
@@ -27,6 +27,8 @@ namespace Supernova {
 
 const int kScreenWidth  = 320;
 const int kScreenHeight = 200;
+const int kFontWidth = 5;
+const int kFontHeight = 8;
 const int kTextSpeed[] = {19, 14, 10, 7, 4};
 const int kMsecPerTick = 55;
 
diff --git a/engines/supernova/state.cpp b/engines/supernova/state.cpp
index 98230c2fb8..28ba850b60 100644
--- a/engines/supernova/state.cpp
+++ b/engines/supernova/state.cpp
@@ -980,12 +980,14 @@ void GameManager::animationOn() {
 void GameManager::edit(Common::String &input, int x, int y, uint length) {
 	bool isEditing = true;
 	uint cursorIndex = input.size();
+	int overdrawWidth = ((length + 1) * kFontWidth > kScreenWidth - x) ?
+	                    kScreenWidth - x : (length + 1) * kFontWidth;
 
 	while (isEditing) {
 		_vm->_textCursorX = x;
 		_vm->_textCursorY = y;
 		_vm->_textColor = COL_EDIT;
-		_vm->renderBox(x, y - 1, 320 - x, 10, HGR_EDIT);
+		_vm->renderBox(x, y - 1, overdrawWidth, 9, HGR_EDIT);
 		for (uint i = 0; i < input.size(); ++i) {
 			// Draw char highlight depending on cursor position
 			if (i == cursorIndex) {