commit 85b5a7487d5b44b94e6d2fc74c997ec69e352b1a
Author:     Simon Howard <fraggle@gmail.com>
AuthorDate: Fri Feb 3 21:10:36 2012 +0000
Commit:     Simon Howard <fraggle@gmail.com>
CommitDate: Fri Feb 3 21:10:36 2012 +0000

    Upgrade the input box and label widgets to use UTF-8 strings.

    Subversion-branch: /trunk/chocolate-doom
    Subversion-revision: 2491
---
 textscreen/examples/guitest.c |  4 ++++
 textscreen/txt_inputbox.c     | 44 +++++++++++++++++++++++++++++--------------
 textscreen/txt_label.c        | 19 ++++++++++++-------
 3 files changed, 46 insertions(+), 21 deletions(-)

diff --git a/textscreen/examples/guitest.c b/textscreen/examples/guitest.c
index df79be2d..a5aad93f 100644
--- a/textscreen/examples/guitest.c
+++ b/textscreen/examples/guitest.c
@@ -179,6 +179,10 @@ void Window2(void)
                    NULL);

     TXT_AddWidget(unselectable_table, TXT_NewLabel("* Unselectable table *"));
+    TXT_AddWidget(unselectable_table, TXT_NewLabel(
+        "This is a UTF-8 string:\n"
+        "\xc3\x80 bient\xc3\xb4t na\xc3\xaet "
+        "\xc3\xa9v\xc3\xaaque \xc3\xa0 l'\xc5\x93uvre p\xc3\xa8re."));

     TXT_AddWidget(window, TXT_NewSeparator("Input boxes"));
     table = TXT_NewTable(2);
diff --git a/textscreen/txt_inputbox.c b/textscreen/txt_inputbox.c
index 2ba08ac6..32704284 100644
--- a/textscreen/txt_inputbox.c
+++ b/textscreen/txt_inputbox.c
@@ -30,6 +30,7 @@
 #include "txt_gui.h"
 #include "txt_io.h"
 #include "txt_main.h"
+#include "txt_utf8.h"
 #include "txt_window.h"

 extern txt_widget_class_t txt_inputbox_class;
@@ -140,9 +141,9 @@ static void TXT_InputBoxDrawer(TXT_UNCAST_ARG(inputbox))
         SetBufferFromValue(inputbox);
     }

-    TXT_DrawString(inputbox->buffer);
+    TXT_DrawUTF8String(inputbox->buffer);

-    chars = strlen(inputbox->buffer);
+    chars = TXT_UTF8_Strlen(inputbox->buffer);

     if (chars < w && inputbox->editing && focused)
     {
@@ -166,26 +167,36 @@ static void TXT_InputBoxDestructor(TXT_UNCAST_ARG(inputbox))

 static void Backspace(txt_inputbox_t *inputbox)
 {
-    if (strlen(inputbox->buffer) > 0)
+    unsigned int len;
+    char *p;
+
+    len = TXT_UTF8_Strlen(inputbox->buffer);
+
+    if (len > 0)
     {
-        inputbox->buffer[strlen(inputbox->buffer) - 1] = '\0';
+        p = TXT_UTF8_SkipChars(inputbox->buffer, len - 1);
+        *p = '\0';
     }
 }

 static void AddCharacter(txt_inputbox_t *inputbox, int key)
 {
-    if (strlen(inputbox->buffer) < inputbox->size)
+    char *end, *p;
+
+    if (TXT_UTF8_Strlen(inputbox->buffer) < inputbox->size)
     {
         // Add character to the buffer

-        inputbox->buffer[strlen(inputbox->buffer) + 1] = '\0';
-        inputbox->buffer[strlen(inputbox->buffer)] = key;
+        end = inputbox->buffer + strlen(inputbox->buffer);
+        p = TXT_EncodeUTF8(end, key);
+        *p = '\0';
     }
 }

 static int TXT_InputBoxKeyPress(TXT_UNCAST_ARG(inputbox), int key)
 {
     TXT_CAST_ARG(txt_inputbox_t, inputbox);
+    unsigned int c;

     if (!inputbox->editing)
     {
@@ -208,16 +219,18 @@ static int TXT_InputBoxKeyPress(TXT_UNCAST_ARG(inputbox), int key)
         inputbox->editing = 0;
     }

-    if (isprint(key))
+    if (key == KEY_BACKSPACE)
     {
-        // Add character to the buffer
-
-        AddCharacter(inputbox, key);
+        Backspace(inputbox);
     }

-    if (key == KEY_BACKSPACE)
+    c = TXT_KEY_TO_UNICODE(key);
+
+    if (c >= 128 || isprint(c))
     {
-        Backspace(inputbox);
+        // Add character to the buffer
+
+        AddCharacter(inputbox, c);
     }

     return 1;
@@ -286,7 +299,10 @@ txt_inputbox_t *TXT_NewInputBox(char **value, int size)
     TXT_InitWidget(inputbox, &txt_inputbox_class);
     inputbox->value = value;
     inputbox->size = size;
-    inputbox->buffer = malloc(size + 1);
+    // 'size' is the maximum number of characters that can be entered,
+    // but for a UTF-8 string, each character can take up to four
+    // characters.
+    inputbox->buffer = malloc(size * 4 + 1);
     inputbox->editing = 0;

     return inputbox;
diff --git a/textscreen/txt_label.c b/textscreen/txt_label.c
index a2afc13b..c4238bf3 100644
--- a/textscreen/txt_label.c
+++ b/textscreen/txt_label.c
@@ -26,6 +26,7 @@
 #include "txt_gui.h"
 #include "txt_io.h"
 #include "txt_main.h"
+#include "txt_utf8.h"
 #include "txt_window.h"

 static void TXT_LabelSizeCalc(TXT_UNCAST_ARG(label))
@@ -68,7 +69,7 @@ static void TXT_LabelDrawer(TXT_UNCAST_ARG(label))
                 align_indent = label->w - strlen(label->lines[y]);
                 break;
         }
-
+
         // Draw this line

         TXT_GotoXY(origin_x, origin_y + y);
@@ -82,8 +83,8 @@ static void TXT_LabelDrawer(TXT_UNCAST_ARG(label))

         // The string itself

-        TXT_DrawString(label->lines[y]);
-        x += strlen(label->lines[y]);
+        TXT_DrawUTF8String(label->lines[y]);
+        x += TXT_UTF8_Strlen(label->lines[y]);

         // Gap at the end

@@ -123,7 +124,7 @@ void TXT_SetLabel(txt_label_t *label, char *value)
     free(label->label);
     free(label->lines);

-    // Set the new value
+    // Set the new value

     label->label = strdup(value);

@@ -144,7 +145,7 @@ void TXT_SetLabel(txt_label_t *label, char *value)
     label->lines = malloc(sizeof(char *) * label->h);
     label->lines[0] = label->label;
     y = 1;
-
+
     for (p = label->label; *p != '\0'; ++p)
     {
         if (*p == '\n')
@@ -159,8 +160,12 @@ void TXT_SetLabel(txt_label_t *label, char *value)

     for (y=0; y<label->h; ++y)
     {
-        if (strlen(label->lines[y]) > label->w)
-            label->w = strlen(label->lines[y]);
+        unsigned int line_len;
+
+        line_len = TXT_UTF8_Strlen(label->lines[y]);
+
+        if (line_len > label->w)
+            label->w = line_len;
     }
 }