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gui.c
308 lines (290 loc) · 12.4 KB
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gui.c
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// Code of GUI written on pure C very fast becomes complicated
#include "gui.h"
#include "renderer.h"
#include "input.h"
TList gGUINodeList;
TGUINode * GUI_CreateNode( void ) {
TGUINode * node = Memory_New( TGUINode );
node->visible = true;
node->color = Vec3_Set( 1.0f, 1.0f, 1.0f );
List_Add( &gGUINodeList, node );
return node;
}
TGUINode * GUI_CreateRect( float x, float y, float w, float h, TTexture * tex ) {
TGUINode * node = GUI_CreateNode();
node->rect = Memory_New( TGUIRect );
node->rect->tex = tex;
node->rect->x = x;
node->rect->y = y;
node->rect->w = w;
node->rect->h = h;
return node;
}
TGUINode * GUI_CreateText( float x, float y, float fieldWidth, float fieldHeight, const char * text, TFont * font ) {
TGUINode * node = GUI_CreateNode();
node->text = Memory_New( TGUIText );
node->text->text = String_Duplicate( text );
node->text->fieldWidth = fieldWidth;
node->text->fieldHeight = fieldHeight;
node->text->x = x;
node->text->y = y;
node->text->font = font;
node->text->width = 0;
node->text->height = font->size;
int length = strlen( text );
for( int i = 0; i < length; i++ ) {
node->text->width += font->charMetrics[(unsigned int)text[i]].advanceX;
}
return node;
}
TGUINode * GUI_CreateButton( float x, float y, float width, float height, TTexture * backgroundTex, TFont * font, const char * text ) {
TGUINode * node = GUI_CreateNode();
node->button = Memory_New( TGUIButton );
node->button->background = GUI_CreateRect( x, y, width, height, backgroundTex );
node->button->text = GUI_CreateText( x, y, width, height, text, font );
GUI_SetTextAlign( node, GUITA_MIDDLE );
node->button->normalColor = Vec3_Set( 1.0f, 1.0f, 1.0f );
node->button->pressedColor = Vec3_Set( 0.8f, 0.8f, 0.8f );
node->button->pickedColor = Vec3_Set( 0.9f, 0.9f, 0.9f );
node->color = node->button->normalColor;
return node;
}
TGUINode * GUI_CreateSlider( float x, float y, float width, float height, TTexture * backgroundTex, TTexture * sliderTex, float minValue, float maxValue, TFont * font, const char * text ) {
TGUINode * node = GUI_CreateNode();
node->slider = Memory_New( TGUISlider );
node->slider->minValue = minValue;
node->slider->maxValue = maxValue;
node->slider->value = maxValue;
node->slider->background = GUI_CreateRect( x, y, width, height, backgroundTex );
node->slider->slider = GUI_CreateRect( width - 10, -4, 10, height + 8, sliderTex );
GUI_Attach( node->slider->slider, node->slider->background );
node->slider->text = GUI_CreateText( width + 10, 0, width, height, text, font );
GUI_Attach( node->slider->text, node->slider->background );
return node;
}
void GUI_FreeNode( TGUINode * node ) {
if( node->button ) {
GUI_FreeNode( node->button->text );
GUI_FreeNode( node->button->background );
Memory_Free( node->button );
}
if( node->text ) {
Memory_Free( node->text );
}
if( node->rect ) {
Memory_Free( node->rect );
}
Memory_Free( node );
}
void GUI_SetNodeText( TGUINode * node, const char * text ) {
if( node->text ) {
Memory_Free( node->text->text );
node->text->text = String_Duplicate( text );
node->text->width = 0;
int length = strlen( text );
for( int i = 0; i < length; i++ ) {
node->text->width += node->text->font->charMetrics[(unsigned int)text[i]].advanceX;
}
} else if( node->button ) {
GUI_SetNodeText( node->button->text, text );
}
}
void GUI_SetTextAlign( TGUINode * node, int textAlign ) {
if( node->text ) {
node->text->textAlign = textAlign;
} else if( node->button ) {
node->button->text->text->textAlign = textAlign;
}
}
void GUI_SetButtonOnClick( TGUINode * node, TGUICallback newOnClick ) {
if( node->button ) {
node->button->OnClick = newOnClick;
}
}
void GUI_SetNodeVisible( TGUINode * node, bool visible ) {
if( node ) {
node->visible = visible;
if( node->button ) {
node->button->text->visible = visible;
node->button->background->visible = visible;
} else if( node->slider ){
node->slider->background->visible = visible;
node->slider->slider->visible = visible;
}
}
}
void GUI_Attach( TGUINode * node, TGUINode * parent ) {
if( parent ) {
node->parent = parent;
List_Add( &parent->childs, node );
// special attachment for compound objects
if( node->button ){
GUI_Attach( node->button->background, parent );
GUI_Attach( node->button->text, parent );
} else if( node->slider ){
GUI_Attach( node->slider->background, parent );
}
} else { // detach
if( node->parent ) {
List_Remove( &node->parent->childs, node );
}
node->parent = 0;
}
}
TVector2 GUI_GetNodeAbsolutePosition( TGUINode * node ) {
TVector2 position = { 0, 0 };
if( node->rect ) {
position.x = node->rect->x;
position.y = node->rect->y;
} else if( node->text ){
position.x = node->text->x;
position.y = node->text->y;
} else if( node->button ) {
position.x = node->button->background->rect->x;
position.y = node->button->background->rect->y;
} else if( node->slider ){
position.x = node->slider->background->rect->x;
position.y = node->slider->background->rect->y;
}
if( node->parent ) {
TVector2 parentPosition = GUI_GetNodeAbsolutePosition( node->parent );
position.x += parentPosition.x;
position.y += parentPosition.y;
}
return position;
}
bool GUI_IsNodeVisible( TGUINode * node ) {
bool visible = node->visible;
if( node->parent ) {
visible &= GUI_IsNodeVisible( node->parent );
}
return visible;
}
bool GUI_MouseInsideRectangle( int x, int y, int w, int h ){
int mouseX = Input_GetMouseX();
int mouseY = Input_GetMouseY();
return (mouseX >= x) && (mouseX <= (x + w)) &&
(mouseY >= y) && (mouseY <= (y + h));
}
void GUI_Render( void ) {
for_each( TGUINode, node, gGUINodeList ) {
if( GUI_IsNodeVisible( node ) ) {
TVector2 absPos = GUI_GetNodeAbsolutePosition( node );
// render and update rectangles
if( node->rect ) {
TGUIRect * pRect = node->rect;
Renderer_BindTexture( pRect->tex, 0 );
Renderer_RenderRect( absPos.x, absPos.y, absPos.x + pRect->w, absPos.y + pRect->h, node->color );
// render and update texts
} else if( node->text ) {
TGUIText * pText = node->text;
Renderer_BindTexture( pText->font->atlas, 0 );
int caretX = absPos.x;
int caretY = absPos.y;
int length = strlen( pText->text );
if( pText->textAlign == GUITA_MIDDLE ) {
caretX += (pText->fieldWidth - pText->width) / 2;
caretY += (pText->fieldHeight - pText->font->size ) / 4;
}
int nextWordPosition = -1; // for wordbreak
for( int i = 0; i < length; i++ ) {
unsigned char symbol = pText->text[i];
TCharMetrics * symbolMetrics = &pText->font->charMetrics[symbol];
// handle wordbreak
int wordWidth = 0;
if( pText->wordBreak ) {
if( i >= nextWordPosition ) {
int wordBegin = -1;
int wordEnd = -1;
bool wordFound = false;
int j = i;
for( ; j < length; j++ ) {
if( isalpha( (unsigned int)pText->text[j] )) {
if( wordBegin < 0 ) {
wordBegin = j;
wordFound = true;
}
} else {
if( wordFound ) {
wordEnd = j;
break;
}
}
}
if( wordFound ) {
if( wordEnd < 0 ) {
wordEnd = j;
}
nextWordPosition = wordEnd;
}
if( wordFound && (wordBegin >= 0) && (wordEnd > 0)) {
for( int k = wordBegin; k < wordEnd; k++ ){
wordWidth += pText->font->charMetrics[(unsigned int)pText->text[k]].advanceX;
}
wordFound = -1;
wordEnd = -1;
wordFound = false;
if( caretX + wordWidth > absPos.x + pText->fieldWidth ) {
caretX = absPos.x;
caretY += pText->font->size;
}
}
}
}
if( symbol != '\n' && symbol != '\t' ) {
TGlyphRenderInfo ri;
ri.x = caretX + symbolMetrics->bitmapLeft;
ri.y = caretY - symbolMetrics->bitmapTop + pText->font->size;
ri.w = pText->font->size;
ri.h = pText->font->size;
memcpy( ri.texCoords, symbolMetrics->texCoords, sizeof( TTexCoord ) * 4 );
ri.color = node->color;
Renderer_RenderGlyph( &ri );
caretX += symbolMetrics->advanceX;
} else if( symbol == '\t' ) { // four space indentation
caretX += pText->font->charMetrics[(unsigned int)' '].advanceX * 4;
}
if( (caretX > absPos.x + pText->fieldWidth) || symbol == '\n' ) {
caretX = absPos.x;
caretY += pText->font->size;
}
}
// render and update buttons
} else if( node->button ) {
TGUIButton * button = node->button;
TGUIRect * background = button->background->rect;
button->background->color = button->normalColor;
if( GUI_MouseInsideRectangle( absPos.x, absPos.y, background->w, background->h )) {
button->background->color = button->pickedColor;
if( Input_IsMouseDown( MB_Left )) {
button->background->color = button->pressedColor;
// execute events
if( button->OnClick ){
button->OnClick();
}
}
}
// update slider
} else if( node->slider ) {
TGUISlider * slider = node->slider;
TGUIRect * sliderRect = slider->slider->rect;
TVector2 sliderRectAbsPos = GUI_GetNodeAbsolutePosition( slider->slider );
if( GUI_MouseInsideRectangle( sliderRectAbsPos.x , sliderRectAbsPos.y, sliderRect->w, sliderRect->h )) {
if( Input_IsMouseDown( MB_Left )) {
sliderRect->x = Input_GetMouseX() - absPos.x - sliderRect->w / 2;
if( sliderRect->x < 0 ){
sliderRect->x = 0;
}
if( sliderRect->x > slider->background->rect->w - sliderRect->w ) {
sliderRect->x = slider->background->rect->w - sliderRect->w;
}
slider->value = ((float)sliderRect->x / (float)slider->background->rect->w) * ( slider->maxValue - slider->minValue );
if( slider->OnValueChanged ) {
slider->OnValueChanged( slider->value );
}
}
}
}
}
}
}