*
* renderer/widget/textinput.c
* - Single line text box
+ *
+ * TODO: Support Right-to-Left text
*/
#include <common.h>
#include "./common.h"
#include "./colours.h"
+#include <unicode.h>
+#include <string.h>
+// TODO: Include a proper keysym header
+#define KEYSYM_LEFTARROW 0x50
+#define KEYSYM_RIGHTARROW 0x4F
+
+struct sTextInputInfo
+{
+ int DrawOfs; // Byte offset for the leftmost character
+ int CursorXOfs; // Pixel offset of the cursor
+
+ int CursorByteOfs;
+ int Length;
+};
+
+// === CONSTANTS ===
+const int ciTextInput_MarginT = 3;
+const int ciTextInput_MarginB = 3;
+const int ciTextInput_MarginV = 6; // Sum of above
+const int ciTextInput_MarginL = 3;
+const int ciTextInput_MarginR = 3;
+const int ciTextInput_MarginH = 6;
+
+// === GLOBALS ===
+tFont *gpTextInput_Font = NULL;
+
+// === CODE ===
void Widget_TextInput_Render(tWindow *Window, tElement *Element)
{
- WM_Render_FillRect(
- Window,
+ struct sTextInputInfo *info = (void*)Element->Data;
+ struct sWidgetWin *wininfo = Window->RendererInfo;
+
+ // Scroll view when X offset reaches either end
+ while(info->CursorXOfs >= Element->CachedW - ciTextInput_MarginH)
+ {
+ int w;
+ uint32_t cp;
+ info->DrawOfs += ReadUTF8( &Element->Text[info->DrawOfs], &cp );
+ WM_Render_GetTextDims(
+ gpTextInput_Font,
+ &Element->Text[info->DrawOfs], info->CursorByteOfs - info->DrawOfs,
+ &w, NULL
+ );
+ info->CursorXOfs = w;
+ }
+ if(info->CursorXOfs < 0)
+ {
+ info->DrawOfs = info->CursorByteOfs;
+ info->CursorXOfs = 0;
+ }
+
+
+ // Borders
+ WM_Render_FillRect(Window,
Element->CachedX, Element->CachedY,
Element->CachedW, Element->CachedH,
TEXTINPUT_BACKGROUND
);
- WM_Render_DrawRect(
- Window,
+ WM_Render_DrawRect(Window,
Element->CachedX, Element->CachedY,
Element->CachedW, Element->CachedH,
TEXTINPUT_BORDER_OUT
);
- WM_Render_DrawRect(
- Window,
+ WM_Render_DrawRect(Window,
Element->CachedX+1, Element->CachedY+1,
Element->CachedW-2, Element->CachedH-2,
TEXTINPUT_BORDER_IN
);
- // TODO: Cursor?
+
+ // Text
+ // - Pre-cursor
+ WM_Render_DrawText(Window,
+ Element->CachedX+ciTextInput_MarginL, Element->CachedY+ciTextInput_MarginT,
+ Element->CachedW-ciTextInput_MarginH, Element->CachedH-ciTextInput_MarginV,
+ gpTextInput_Font, TEXTINPUT_TEXT,
+ &Element->Text[info->DrawOfs], -1
+ );
+
+ // Cursor
+ if( wininfo->FocusedElement == Element )
+ {
+ WM_Render_SetTextCursor(Window,
+ Element->CachedX+ciTextInput_MarginL+info->CursorXOfs,
+ Element->CachedY+ciTextInput_MarginR,
+ 1, Element->CachedH-ciTextInput_MarginV,
+ TEXTINPUT_TEXT
+ );
+ }
}
void Widget_TextInput_Init(tElement *Element)
{
+ struct sTextInputInfo *info;
int h;
// TODO: Select font correctly
- WM_Render_GetTextDims(NULL, "jJ", NULL, &h);
+ WM_Render_GetTextDims(gpTextInput_Font, "jy|qJ", -1, NULL, &h);
- h += 2+2; // Border padding
+ h += ciTextInput_MarginV; // Border padding
Element->MinH = h;
- Element->MinW = 4;
+ Element->MinW = ciTextInput_MarginH;
- _SysDebug("h = %i", h);
+ info = Element->Data = malloc(sizeof(*info));
+ info->DrawOfs = 0;
+ info->CursorXOfs = 0;
+ info->CursorByteOfs = 0;
+ info->Length = 0;
// No need to explicitly update parent min dims, as the AddElement routine does that
}
-DEFWIDGETTYPE(ELETYPE_TEXTINPUT,
+int Widget_TextInput_KeyFire(tElement *Element, int KeySym, int Character)
+{
+ struct sTextInputInfo *info = Element->Data;
+ int len;
+ int w;
+ char *dest;
+ uint32_t cp;
+
+// _SysDebug("Key 0x%x fired ('%c')", Character, Character);
+
+ if( Character == 0 )
+ {
+ switch(KeySym)
+ {
+ case KEYSYM_LEFTARROW:
+ if( info->CursorByteOfs > 0 )
+ {
+ len = ReadUTF8Rev(Element->Text, info->CursorByteOfs, &cp);
+ info->CursorByteOfs -= len;
+ WM_Render_GetTextDims(
+ gpTextInput_Font,
+ Element->Text+info->CursorByteOfs,
+ len, &w, 0
+ );
+ info->CursorXOfs -= w;
+ }
+ break;
+ case KEYSYM_RIGHTARROW:
+ if( info->CursorByteOfs < info->Length )
+ {
+ len = ReadUTF8(Element->Text + info->CursorByteOfs, &cp);
+ WM_Render_GetTextDims(
+ gpTextInput_Font,
+ Element->Text+info->CursorByteOfs,
+ len, &w, 0
+ );
+ info->CursorByteOfs += len;
+ info->CursorXOfs += w;
+ }
+ break;
+ }
+ return 0;
+ }
+
+ // TODO: Don't hard code
+ if(Character > 0x30000000) return 0;
+
+ switch(Character)
+ {
+ case '\t':
+ return 0;
+
+ case '\b':
+ // Check if there is anything to delete
+ if( info->CursorByteOfs == 0 ) return 0;
+ // Get character to be deleted
+ len = ReadUTF8Rev(Element->Text, info->CursorByteOfs, &cp);
+ info->CursorByteOfs -= len;
+ dest = &Element->Text[info->CursorByteOfs];
+// _SysDebug("\\b, len = %i, removing '%.*s'", len, len, dest);
+ WM_Render_GetTextDims(gpTextInput_Font, dest, len, &w, 0);
+ // Remove from buffer
+ memmove(dest, &dest[len], info->Length - info->CursorByteOfs - len);
+ info->Length -= len;
+ Element->Text[info->Length] = '\0';
+ // Adjust cursor
+ info->CursorXOfs -= w;
+ break;
+ default:
+ if(Character >= 0x30000000) return 0;
+ if(Character < ' ') return 0;
+
+ // Get required length
+ len = WriteUTF8(NULL, Character);
+
+ // Create space (possibly in the middle)
+ Element->Text = realloc(Element->Text, info->Length + len + 1);
+ dest = &Element->Text[info->CursorByteOfs];
+ memmove(&dest[len], dest, info->Length - info->CursorByteOfs);
+ // Add the character
+ WriteUTF8(dest, Character);
+ info->CursorByteOfs += len;
+ info->Length += len;
+ Element->Text[info->Length] = '\0';
+
+ // Update the cursor position
+ // - Scrolling is implemented in render function (CachedW/CachedH are invalid atm)
+ WM_Render_GetTextDims(gpTextInput_Font, dest, len, &w, NULL);
+ info->CursorXOfs += w;
+ }
+
+ // TODO: Have a Widget_ function to do this instead
+ WM_Invalidate(Element->Window, 1);
+
+ return 0;
+}
+
+DEFWIDGETTYPE(ELETYPE_TEXTINPUT, "TextInput",
WIDGETTYPE_FLAG_NOCHILDREN,
.Render = Widget_TextInput_Render,
- .Init = Widget_TextInput_Init
+ .Init = Widget_TextInput_Init,
+ .KeyFire = Widget_TextInput_KeyFire
);
-
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