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-rw-r--r--box.c213
1 files changed, 136 insertions, 77 deletions
diff --git a/box.c b/box.c
index 78f59e9..bc360a6 100644
--- a/box.c
+++ b/box.c
@@ -79,6 +79,14 @@ Delete(wchar_t* Text, u64 Pos)
(MAX_INPUT_LEN - Pos - 1) * sizeof(*Text));
}
+Bool
+IsInRect(rect Rect, u32 X, u32 Y)
+{
+ if ((X >= Rect.X && X <= Rect.X + Rect.W) &&
+ (Y >= Rect.Y && Y <= Rect.Y + Rect.H)) return True;
+ return False;
+}
+
int
main(void)
{
@@ -87,7 +95,6 @@ main(void)
tb_init();
- u32 InputPos = 0;
u32 InputLen = 0;
#if 1
@@ -112,31 +119,54 @@ main(void)
TextBox.W - 2*BOX_PADDING_X - 2*BOX_BORDER_WIDTH,
TextBox.H - 2*BOX_BORDER_WIDTH
};
- u32 TextSurface = Text.W * Text.H;
#undef BOX_PADDING_X
#undef BOX_BORDER_WIDTH
-
- DrawBox(TextBox, 0);
-
- // Draw the text
- u32 XOffset = 0, YOffset = 0;
- for (u32 At = 0;
- (At < InputLen) && (At < TextSurface) ;
- At++)
- {
- tb_printf(Text.X + XOffset,
- Text.Y + YOffset,
- 0, 0,
- "%lc", Input[At]);
- XOffset++;
- if (XOffset == Text.W) { YOffset++; XOffset = 0; }
- }
+ u32 TextSurface = Text.W * Text.H;
global.cursor_x = Text.X;
global.cursor_y = Text.Y;
+ u32 TextOffset = 0;
+ u32 InputPos = 0;
+
while (ev.key != TB_KEY_CTRL_C)
{
+
+ tb_clear();
+
+ DrawBox(TextBox, 0);
+
+ // Draw the text right of the cursor
+ // NOTE: the cursor is assumed to be in the box
+ // assert(IsInRect(Text, global.cursor_x, global.cursor_y));
+ u32 AtX = Text.X, AtY = Text.Y;
+ u32 At = TextOffset;
+ while (AtY < Text.Y + Text.H)
+ {
+ if (At < InputLen)
+ {
+ tb_printf(AtX++, AtY, 0, 0, "%lc", Input[At++]);
+ }
+ else
+ {
+ // Erase previous text
+ tb_printf(AtX++, AtY, 0, 0, " ");
+ }
+
+ if (AtX == Text.X + Text.W) { AtY++; AtX = Text.X; }
+ }
+
+ // Position in input based on cursor position
+ InputPos = TextOffset + (global.cursor_x - Text.X) + (global.cursor_y - Text.Y) * Text.W;
+
+#ifdef DEBUG
+ tb_printf(TextBox.X, TextBox.Y, 0, 0,
+ "%2d,%-2d +%d #%-2d %d/%d",
+ global.cursor_x, global.cursor_y,
+ TextOffset, InputPos,
+ InputLen, MAX_INPUT_LEN);
+#endif
+
tb_present();
tb_poll_event(&ev);
@@ -145,98 +175,135 @@ main(void)
{
switch (ev.key)
{
+ // Delete character forwards
case TB_KEY_CTRL_D:
{
if (InputPos == InputLen) break;
Delete(Input, InputPos);
- Input[MAX_INPUT_LEN - 1] = 0;
InputLen--;
+ // Delete(Input, Position)
} break;
+ // Delete Word backwards
case TB_KEY_CTRL_W:
{
- // TODO: this could be one memmove call
- while (InputPos && is_whitespace(Input[InputPos - 1]))
+ u32 At = InputPos;
+ // Find character to stop on
+ while (At && is_whitespace(Input[At - 1])) At--;
+ while (At && !is_whitespace(Input[At - 1])) At--;
+
+ u32 NDelete = InputPos - At;
+ memmove(Input + At, Input + InputPos, (InputLen - InputPos) * sizeof(Input[At]));
+ InputLen -= NDelete;
+
+ if (NDelete > global.cursor_x)
{
- InputPos--;
- InputLen--;
- Delete(Input, InputPos);
- Input[MAX_INPUT_LEN - 1] = 0;
+
}
- while (InputPos && !is_whitespace(Input[InputPos - 1]))
- {
- InputPos--;
- InputLen--;
- Delete(Input, InputPos);
- Input[MAX_INPUT_LEN - 1] = 0;
+ global.cursor_x -= NDelete;
+ if (global.cursor_x < Text.X) {
+ global.cursor_y--;
+ global.cursor_x += Text.W;
+ if (global.cursor_y < Text.Y)
+ {
+ global.cursor_y = Text.Y + Text.H - 1;
+ TextOffset -= TextSurface;
+ }
}
+ assert(IsInRect(Text, global.cursor_x, global.cursor_y));
} break;
+ // Delete until start of line
case TB_KEY_CTRL_U:
{
- if (!InputPos) break;
- memmove(Input,
- Input + InputPos,
- (InputLen - InputPos) * sizeof(wchar_t));
- InputLen -= InputPos;
- InputPos = 0;
+ // memmove until first character
} break;
// Delete until end of input
- case TB_KEY_CTRL_K: InputLen = InputPos; break;
+ case TB_KEY_CTRL_K: break;
// Move to start
- case TB_KEY_CTRL_A: InputPos = 0; break;
+ case TB_KEY_CTRL_A: break;
// Move to end
- case TB_KEY_CTRL_E: InputPos = InputLen; break;
+ case TB_KEY_CTRL_E: break;
// Move backwards by one character
- case TB_KEY_CTRL_B: if (InputPos) InputPos--; break;
+ case TB_KEY_CTRL_B: break;
// Move forwards by one character
- case TB_KEY_CTRL_F: if (InputPos < InputLen) InputPos++; break;
+ case TB_KEY_CTRL_F: break;
// Move backwards by word
- case TB_KEY_ARROW_LEFT:
- {
- while (InputPos && is_whitespace(Input[--InputPos]));
- while (InputPos && !is_whitespace(Input[--InputPos]));
- } break;
+ case TB_KEY_ARROW_LEFT: { } break;
// Move forwards by word
- case TB_KEY_ARROW_RIGHT:
- {
- while (InputPos < InputLen && is_whitespace(Input[InputPos])) InputPos++;
- while (InputPos < InputLen && !is_whitespace(Input[++InputPos]));
- } break;
+ case TB_KEY_ARROW_RIGHT: { } break;
}
}
+
// Insert new character in Input at InputPos
else if (ev.ch && InputLen < MAX_INPUT_LEN)
{
- memmove(Input + InputPos + 1,
- Input + InputPos,
- (MAX_INPUT_LEN - InputPos - 1) * sizeof(*Input));
- Input[InputPos++] = ev.ch;
- InputLen++;
}
else
{
switch (ev.key)
{
+ // Delete character backwards
case TB_KEY_BACKSPACE2:
{
- if (!InputLen) break;
- Input[InputPos--] = 0;
- InputLen--;
} break;
+ case TB_KEY_ARROW_UP:
+ {
+ if (global.cursor_y == Text.Y)
+ {
+ if (TextOffset == 0)
+ {
+ global.cursor_x = Text.X;
+
+ break;
+ }
+
+ TextOffset -= TextSurface;
+ global.cursor_y = Text.Y + Text.H - 1;
+ }
+ else
+ {
+ global.cursor_y--;
+ }
+ } break;
+ case TB_KEY_ARROW_DOWN:
+ {
+ if (InputPos + Text.W > InputLen)
+ {
+ // Put the cursor on the last character
+ global.cursor_x = Text.X + (InputLen - TextOffset) % (Text.W);
+ global.cursor_y = Text.Y + (InputLen - TextOffset) / Text.W;
+
+ break;
+ }
+
+ if (global.cursor_y == Text.Y + Text.H - 1)
+ {
+ TextOffset += TextSurface;
+ global.cursor_y = Text.Y;
+ }
+ else
+ {
+ global.cursor_y++;
+ }
+ } break;
+
+ // Move character left or scroll
case TB_KEY_ARROW_LEFT:
{
- if (InputPos) InputPos--;
+ if (InputPos == 0) break;
- // Text is assumed to start on (Text.X, Text.Y)
+ // If text is on the first character of the box scroll backwards
if (global.cursor_x == Text.X &&
global.cursor_y == Text.Y)
{
- if (InputPos == 0) break;
global.cursor_x = Text.X + Text.W - 1;
global.cursor_y = Text.Y + Text.H - 1;
- // TODO: scroll
+
+ // Scroll
+ TextOffset -= TextSurface;
+
break;
}
@@ -248,22 +315,23 @@ main(void)
}
} break;
+ // Move character right or scroll
case TB_KEY_ARROW_RIGHT:
{
if (InputPos == InputLen) break;
- InputPos++;
-
+ // If cursor is on the last character scroll forwards
if (global.cursor_x == Text.X + Text.W - 1 &&
global.cursor_y == Text.Y + Text.H - 1)
{
-
global.cursor_x = Text.X;
global.cursor_y = Text.Y;
+ // Scroll
+ TextOffset += TextSurface;
+
break;
}
- // TODO: scroll
global.cursor_x++;
if (global.cursor_x == Text.X + Text.W)
@@ -275,15 +343,6 @@ main(void)
}
}
-#ifdef DEBUG
- tb_printf(TextBox.X, TextBox.Y, 0, 0,
- "%2d,%-2d #%-2d %d/%d",
- global.cursor_x, global.cursor_y,
- InputPos,
- InputLen, MAX_INPUT_LEN);
-#endif
-
-
}
tb_shutdown();
generated by cgit v1.2.3 (git 2.39.1) at 2025-05-03 15:38:45 +0000