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Allowing the cursor to be set anywhere in the string of a TextEdit widget

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This commit is contained in:
Joel Bodenmann 2015-12-13 18:46:53 +01:00
parent 682a5efc42
commit 371e68beee
1 changed files with 26 additions and 1 deletions
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27
src/gwin/gwin_textedit.c
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@ -46,6 +46,31 @@ static bool_t resizeText(GWidgetObject* gw, size_t pos, int32_t diff) {
return TRUE;
}
// Function that allows to set the cursor to any position in the string
// This should be optimized. Currently it is an O(n^2) problem and therefore very
// slow. An optimized version would copy the behavior of mf_get_string_width()
// and do the comparation directly inside of that loop so we only iterate
// the string once.
static void TextEditMouseDown(GWidgetObject* gw, coord_t x, coord_t y) {
uint16_t i = 0;
// Directly jump to the end of the string
if (x > gdispGetStringWidth(gw->text, gw->g.font)) {
gw2obj->cursorPos = strlen(gw->text);
// Otherwise iterate through each character and get the size in pixels to compare
} else {
i = 1;
while (gdispGetStringWidthCount(gw->text, gw->g.font, i) < x) {
i++;
}
gw2obj->cursorPos = i-1;
}
_gwinUpdate((GHandle)gw);
}
#if (GFX_USE_GINPUT && GINPUT_NEED_KEYBOARD) || GWIN_NEED_KEYBOARD
static void TextEditKeyboard(GWidgetObject* gw, GEventKeyboard* pke) {
// Only react on KEYDOWN events. Ignore KEYUP events.
@ -138,7 +163,7 @@ static const gwidgetVMT texteditVMT = {
gwinTexteditDefaultDraw, // default drawing routine
#if GINPUT_NEED_MOUSE
{
0, // Process mouse down events (NOT USED)
TextEditMouseDown, // Process mouse down events (NOT USED)
0, // Process mouse up events (NOT USED)
0, // Process mouse move events (NOT USED)
},